Saikin, Imouto no Yousu ga Chotto Okashiinda ga. The fairly dangerous School Festival Prologue

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Editor: Leo

Prologue

“I’m home~” said Kanzaki Yuuya as he stepped into his house, but there came no ‘Welcome back’ as a response.

Is Mitsuki not back yet?

As he set foot into the living room, his little sister Mitsuki was standing in the kitchen.

“………”

She had an apron above her uniform, glaring at the takoyaki pan with a horribly stern expression.

“Mitsuki, you were home?”

“……”

Yuuya called out to her, but Mitsuki showed no signs of pulling away her gaze from the takoyaki pan. Yuuya was even astonished, and moved, at the ghastly Mitsuki’s ability to concentrate. The reason as to why she was so diligently grilling the takoyaki is because the school festival was coming close. Apparently, her class decided to be selling takoyaki there, so she was secretly practicing as far as Yuuya could judge.

That would explain why Mitsuki’s self-made lunch box recently had been rice with takoyaki, fairly Osaka-nised. At first, there had always been a weirdly shaped, distorted piece of takoyaki in the place where the side dish went (where the tip of the octopus leg would stick out at times), which left Yuuya in surprise, so he thought that something might have pampered with her mood yet again.

However, the other day, when Yuuya spotted the list of the different attractions the classes were planning on doing, and seeing Mitsuki’s class doing takoyaki, it all connected. Apparently, they were focusing on a takoyaki maid cafe. A normal maid cafe was very lucrative already, but takoyaki is a must-have on school festivals.

On a side note, Mitsuki’s cooking skill isn’t on the good side of things. Recently, she just bought a cooking book to learn from, trying her best to make simple things with clumsy skills. Meaning that she needed special training—which clearly boiled down to her working hard on making takoyaki at home like this, to prepare for the real deal.

As he stood next to his little sister, intensely glaring down at the takoyaki, Yuuya joined her, throwing the sizzling takoyaki an equally passionate gaze.

“………”

Mitsuki did not realize Yuuya’s presence in the slightest, carefully trying to turn over the takoyaki. However, she was unable to cleanly pull that off, and with clumsy hand movement, she messed up the dough. Every time that happened, she lowered her brow in a displeased manner. Watching that serious expression from the side, Yuuya was about to bust out laughing.

“—You’re still missing some oil here. Did you put enough on before starting?”

“?!”

As Yuuya gave Mitsuki a valuable tip, Mitsuki jumped up on the spot ever so slightly, and threw a harsh glare at him. She looked like a hostile cat, all her hair standing up straight.

“Wha—?! What?! Why are you here?! Since when?!”

“I did say ‘I’m home’ a few minutes ago, but you didn’t hear me because you were so busy with the takoyaki, right?”

“……Hmpf.” Mitsuki puffed out her lips, and averted her face.

“Anyway, we can still fix this sloppy takoyaki. Look, if we do it like this—”

As Yuuya took Mitsuki’s hand from behind, he used the pick to skillfully gather up the dough in the middle, giving his wrist a quick snap to turn it around.

“?!”

Mitsuki twisted her body as she was inside Yuuya’s arms.

“Ha…Ahhh…”

She narrowed her eyebrows, leaking out a sweet moan. However, Yuuya paid that no mind, as he kept holding onto her hand, giving her a lecture.

“If you manage to stab it deeply, and be able to cleanly turn around your wrist, you should be able to do it as well. But, most importantly is that you put enough oil in there to begin with.”

“…No, ah…Ahh…”

Mitsuki’s face turned red in a matter of seconds, as her body started to give off small spasms. To her misfortune, Yuuya was already too focussed on the takoyaki that he didn’t notice the heavy chance of his little sister’s condition.

“Ah…N-Noo…”

A heated voice leaked out of Mitsuki’s mouth, making Yuuya finally realize that something was off with her.

“Hm? What’s wrong, Mitsuki? Did I do something bad?”

“N-N-Nothing…Nothing at all!”

Inside Yuuya’s arms, Mitsuki averted her expression yet again, as her body stiffened up. However, her hand was burning hot, building up quite a sweat. Because of the sweat on her head, her hair was glued to her face, as her breathing grew more rough. The area around her eyes reddened up as well, and the second Yuuya realized that, his heart skipped a beat.

“I…Is that so…”

He tried his best not to pay it any mind, and focussed back on the takoyaki, but now that he realized the strange condition of his little sister, he couldn’t quite rid his head from that. As a result, even his own hands started to get sweaty.

“H-Hey…Your hands…are really sweaty, you know?”

“?! M-Mitsuki’s as well though?!”

“N-No they’re not!”

While going back and forth, akin to a small fight between siblings, Mitsuki’s body suddenly convulsed with an “Ah…” as she let out a feeble voice, which left Yuuya with a weird tingling feeling.

“W-What happened? Mitsuki, you’re acting a bit weird…?”

“N-N-No! Everything is just as always!”

She threw Yuuya a harsh glare yet again, but her eyes were watery, transmitting a certain amorous atmosphere. Feeling like he had done something perverted judging from that reaction, Yuuya froze up on that spot.

“Eh…Um…Ahh…”

Letting go of Mitsuki’s hand here would make things even more awkward, but keeping the situation going could invite some sort of bad incident. Although he didn’t go as far as thinking what exactly might happen, all he knew is that things would end badly.

“Ahhh…Mmm…”

A seductive voice coming from Mitsuki, as she used her free hand to close off her own mouth, her body shaking furiously.

“—Are you…Not feeling well? Your face is red, so what if you have a fever…”

“No…that’s…not…it……okay.”

Mitsuki started fidgeting with her thighs, her breathing rough, as she shook her head sideways.

“Then what’s wrong? Just tell me.”

“A-As if I could tell you!”

Yuuya flinched as Mitsuki suddenly barked at him. As always, he was unable to grasp what exactly was going on with his little sister. He was unable to read her reaction as per usual.

“Uuu…Uuuu…Why does…it end up…like this…”

Mitsuki grew teary-eyed, glaring at Yuuya over her shoulders, biting into her lip in a frustrated manner. Watching this reaction happen live in front of him, Yuuya swallowed his breath.

What is that reaction?! We’re not doing anything lewd though?!

All they were doing was making takoyaki together. Or so it should have been, but Yuuya was left clueless as to why his little sister was acting like she was in heat. Not knowing what to do in this situation, he just averted his eyes, only for his ears to react on a sharp “Haaaa…” sigh from Mitsuki, which sounded different from her seductive one seconds ago. As if it was meant for his ears. Yuuya showed a confused reaction, as Mitsuki whispered at him, her eyes filled with intended seduction.

“Aha, really, Onii-chan…doing this from behind…so bold…”

As if it was a completely different person, Mitsuki now let out a soft, teasing giggle.

“?! W-W-W-What?!”

“Ehhh? Even though you should know~?”

Her brusqueness was washed away like it was a fantasy, as Mitsuki laughed yet again. Seeing this sudden change, and surprising reaction, Yuuya was left in confusion.

“Takoyaki is good and all…But I’d like you to teach me lots of other stuff as well. Okay, Onii-chan?” said Mitsuki, as she let go of the takoyaki pick, tightly gripping Yuuya’s hand.

Her hand, drenched in sweat, was unbelievably soft, making Yuuya swallow his saliva.

“Teach you…more…L-Like what…”

In this situation, the one not getting any erotic ideas was clearly the weird one. To be precise, the Mitsuki inside his head just went “Teach me more perverted stuff, Onii-chan~” as she put Yuuya’s hand on her own chest, inducing an act that would leave them unable staying just normal siblings…Fantasies like these were filling his head at rapid succession.

Wait, as if something like that would actually happen?! She’s just my little sister after all!

He quickly shook his head to rid himself of these impure fantasies.

“What’s wrong, Onii-chan? Shaking your head like that. What were you thinking about just now?”

Flashing a cheeky smile, she pressed her cheek against Yuuya’s hand, giving it a strong lick.

“! W-W-W-Wha?!”

As the soft, and also warm sensation got in contact with his fingers, Yuuya was unable to hide his discomposure.

“There was some dough on your hand. Fufu, delicious~”

While licking Yuuya’s finger with her small tongue, Mitsuki narrowed her eyes as she spoke.

“?!”

All the while being bewitched by Mitsuki’s sudden change of behaviour, Yuuya was unable to calm down.

This…is definitely weird…!

As of recently, his little sister had been acting a bit weird—No, not just a bit. The Mitsuki that was always acting hold and moody would sometimes have a complete turn of events, acting like a spoiled child, actively seeking out skinship like this. Also, while he was normally being called just ‘You’ by her, when this change happens, her way of addressing him would switch to ‘Onii-chan’ instead. Although there was no end to his weirdness, the most decisive factor Yuuya could revert back to were those panties…

“Say…haven’t you been acting a bit weird recently?”

Before he even realized it, those thoughts just leaked out of Yuuya’s mouth.

“?!”

The moment those words reached her ears, Mitsuki’s face burned up even further. Although her usual displeased expression floated across her face for a mere second, it quickly reverted back to a mixture of anger and embarrassment, as she bit into Yuuya’s finger, softly whispering towards him.

“The reason I’ve gotten weird is all because of you, Onii-chan, you know?”

Mitsuki’s suggestive words reverberated inside Yuuya’s chest.

No no no, my fault…? It’s not meant in a weird way I’m sure, but…her surroundings just changed after the remarriage, that’s gotta be it. Right…?

“Do you want…to know the reason?”

“Well…Of course…”

While his little sister was softly biting on his finger, Yuuya was trying to look away from her, speaking up in a mumbling way.

“……”

Towards this way of phrasing things that made it sound like an incoming confession from Mitsuki, Yuuya tried his best to keep a calm head, but his heart was beating so fast he was worried that Mitsuki might be able to hear. But, that’s when it happened. Mitsuki just kept quiet instead of speaking up, her body starting to tremble.

“M-Mitsuki? Are you okay?!”

Yuuya tried to frantically check for her condition as he approached her, but…

“Not at all! I’m not fine in any way!”

Just when he heard that sharp scream of hers, Mitsuki bit down on his finger, which she had been nibbling on before.

“Ouuuuuuuuuuuuuuuuuuuuuuuuuuch?!”

The howl like an owner having been bitten by their own dog resounded through the Kanzaki residence.

*

“Really! Will you give it a rest already, Hiyori!”

Dashing into the bathroom of the house, Mitsuki tilted her gaze upwards towards the ceiling. Shortly after, a girl with angelic wings on her back appeared out of thin air. With fluffy, semi-long hair, and a big ribbon decorating that, the girl equally had a hand on her hip, flying mid-air as she looked down.

“Isn’t that my phrase?! Mitsuki you idiot! Good-for-nothing! Small breasts girl! It felt like the perfect chance just now between me and Onii-chan, so don’t get between us like that!”

“Shut up! You were clearly going too far Hiyori! He only taught me how to make takoyaki, and things suddenly ended up like that! No matter what you think about it, it’s clearly weird!”

“That’s just because you’re easily embarrassed by everything, Mitsuki!”

“Don’t just act like it’s my fault! What do you mean ‘Onii-chan’, huh?! Don’t just call him weird names!”

“Really, you’re so stubborn. What’s wrong with calling Onii-chan Onii-chan?!”

“Everything! Also, my family only consists of me and my mother…Not with some stranger like him!”

“Okay okay okay! I’ve heard that phrase enough times now! Let’s just check how much of the gauge we filled up with that, okay?”

The girl called Hiyori let her eyes flicker with excitement, as her mouth turned into a ω form, clinging to Mitsuki.

“Wha?! N-No! Stop…”

“Fu fu fu, don’t be like that, I know you enjoy this just as much. Anyway, let’s see…”

Not paying any heed to the resisting Mitsuki, Hiyori just flipped up her skirt without any remorse. Beneath her skirt appeared rather ungirly panties…A leather belt, connected with two metallic chains, covering up her most important part.

“See, almost a full tank! Since the TST can’t lie, you might as well just stop lying about it, and accept it. Really, why are you so dishonest, Mitsuki?”

Hiyori teased Mitsuki as she crouched down to check the heart gauge attached to the leather belt that she called TST. Inside this heart gauge, a liquid was filling up towards the top. A mere fragment of a second later, Mitsuki’s face turned bright red, even until her earlobes.

“T-This…isn’t my fault, okay?! It’s because you’re possessing me, Hiyori!”

“Hmmm? I really don’t think that’s all though? I mean, the gauge has been feeling more and more comparing it to the beginning~ And you should know it best yourself, Mitsuki~”

“…I-It’s just your imagination, okay?!”

“Okay okay okay~ Then, let’s just leave it at that~ Either way, it’s a good thing that the heart gauge fills up more easily~ Let’s be even more lovey-dovey with Onii-chan, and fill up the gauge even quicker~ Yeaaah!”

As always, Hiyori was too energetic for her own good, as she raised her hand into the air.

“…Don’t make it sound so simple. We’re siblings after…all…so this normally doesn’t happen!”

“No need to be so stiff about it~ You’re not blood-related, so it’s all OK~”

“…T-That’s not the problem…”

“But, Mitsuki, you don’t want to die, right?”

Hiyori pressed her finger onto Mitsuki’s lips, giving a faint snicker.

“If we aren’t lovey-dovey enough with Onii-chan, filling up the heart gauge, I can’t go to heaven. I told you that before, right? And it’s not just that, you might also die if we fail, Mitsuki.”

“……”

As Hiyori’s tone suddenly changed into a more threatening one, with a stern gaze, Mitsuki swallowed her breath. Seeing the normally innocent and simple-minded Hiyori act all mysterious like that was giving Mitsuki goosebumps. Her outer appearance was akin to a pure angel, carelessly gleeful all the time, but her true identity was actually a ghost currently possessing Mitsuki.

With her target of regret being Yuuya, who she had loved during the time she was still alive, she possessed Mitsuki in order to be lovey-dovey with him, clear up her regrets, and pass on. And, this TST is an item that reflects Hiyori’s gauge of satisfaction. Every time the gauge fills up, another step gets added on the stairs towards the Gate of Heaven, but the way is still long.

To make things worse, in the cases that jealousy or suspicion would be induced instead of happy feelings, it reacts to this negative emotion as well. Before, the gauge had turned pitch-black, inducing a high fever. Just remembering that, Mitsuki turned pale. If she doesn’t get more lovey-dovey with Yuuya, she will die—And no matter how much she tried to not think about it, it would always creep around in the back of her head. Basically, there wasn’t a ‘No’ choice for Mitsuki.

“That’s why, let’s work hard to be lovey-dovey with Onii-chan, okay?” Embracing Mitsuki from behind, Hiyori whispered those words into her ear.

The arriving hot breath tickled her ear, making her shoulders jump up ever so slightly. Watching this reaction, the corners of Hiyori’s mouth distorted into a teasing smile.

“So cute~ Mitsuki, you’re still sensitive from just now, right?”

“N…No! What are you talking about?! Hiyori you idiot! Idiot!”

“No need to be so embarrassed, really. I’m sure that Onii-chan likes sensitive girls as well~”

As Hiyori ran her fingers across Mitsuki, her body started to burn up, like she had just gotten out of a shower, sweating furiously.

“No?! H-Hey…What are you thinking?! My uniform will get drenched?!”

“You have a spare, right? Don’t sweat the small stuff, really. For now…just focus…”

Hiyori softly bit into Mitsuki’s ear this time, grabbing both her hands, and slowly moved them towards her reserved chest. And then, she made Mitsuki’s hands dig into her own, soft chest.

“Ah?! Mmm…?! F-Focus…On what?!”

“Isn’t that obvious? Don’t make me say it…Imagine the continuation from just now…Just think of my hands as Onii-chan’s…See…Onii-chan will teach you…lots of perverted stuff.”

“Mmm?! Ahhh…Don’t…be ridiculous…Hiyori, you idiot…Super idiot!”

The moment she gripped the hardened tips through the bra, an electric current ran through Mitsuki’s body.

As if…I could do that…This is way too embarrassing…I’ll die for real…

Gazing at her own embarrassing appearance in the mirror, Mitsuki’s body started writhing in agony. Her drenched blouse started sticking to her skin, her bra becoming transparent the more time passes. Unable to watch her own expression melt from the pleasure, Mitsuki tightly shut her eyes. However, that only helped in making her more sensitive to her other senses. At the same time, Yuuya’s appearance while teaching her how to cook takoyaki flew back into her head. His hand would softly massage her chest, while carefully taking off her blouse.

“Ah…No…Mmm…Don’t…look…”

A voice so sweet and seductive leaked out of her mouth, making her doubt for a second if she was the one who produced it, as she started blushing even more furiously.

“That voice just now wasn’t too bad! Let me hear more of your cute voice, Mitsuki~”

“No…ooo…No no no! Don’t…no more…”

Mitsuki was inside Hiyori’s arms, throwing a tantrum like a cat as she shook her head left and right.

“Fu fu fu, let’s see how long you can resist~”

Along with that singing voice, Hiyori went ahead to take off Mitsuki’s bra, only to keep fondling her chest after it has been exposed, pushing one hand of hers beneath Mitsuki’s skirt.

“Ugh…Uuu…I-I keep…telling you to stop! Ah…N-No!”

“Are you sure about that? Listen, it’s just an experiment, just training~ Look, imagine my fingers to be Onii-chan’s. Come on, say it. ‘Ahhnn…Onii-chan, you pervert…’!”

“Don’t unnecessarily dramatize it! I would never say that! Hiyori, you idiot!”

Hiyori completely ignored her pleas, as she moved Mitsuki’s fingers in between the gaps of the TST. Even though she didn’t want to, she imagined those fingers to be Yuuya’s for just a second—Only to quickly shake her head left and right. In the meantime, Hiyori pushed Mitsuki’s fingers even deeper into the TST. The moment her fingers entered the deeper part of her most important place, Mitsuki blanked out, only letting out a despairing scream.

“?! No! Stoooooooooooooooooop!?”

The same moment Mitsuki raised this scream of ecstasy, the gauge of the TST filled up completely, glowing in a strong light.

“Yeah, good good. The gauge filled up quite a bit~ Mitsuki, good work today~”

While kissing Mitsuki on the forehead several times, Hiyori patted her on the head, very pleased with the result.

“………”

Mitsuki just rested inside Hiyori’s arms, unable to even give a response. She really wanted to complain about her ‘Good work’ comment, but her lips wouldn’t listen to her anymore, unable to press out any words.

“Really, ending up like this…Mitsuki, you pervert~”

Although Hiyori most likely had no ill intentions with it, Mitsuki could only retort inside her heart.

“I’m home~” said Kanzaki Yuuya as he stepped into his house, but there came no ‘Welcome back’ as a response.

Is Mitsuki not back yet?

As he set foot into the living room, his little sister Mitsuki was standing in the kitchen.

“………”

She had an apron above her uniform, glaring at the takoyaki pan with a horribly stern expression.

“Mitsuki, you were home?”

“……”

Yuuya called out to her, but Mitsuki showed no signs of pulling away her gaze from the takoyaki pan. Yuuya was even astonished, and moved, at the ghastly Mitsuki’s ability to concentrate. The reason as to why she was so diligently grilling the takoyaki is because the school festival was coming close. Apparently, her class decided to be selling takoyaki there, so she was secretly practicing as far as Yuuya could judge.

That would explain why Mitsuki’s self-made lunch box recently had been rice with takoyaki, fairly Osaka-nised. At first, there had always been a weirdly shaped, distorted piece of takoyaki in the place where the side dish went (where the tip of the octopus leg would stick out at times), which left Yuuya in surprise, so he thought that something might have pampered with her mood yet again.

However, the other day, when Yuuya spotted the list of the different attractions the classes were planning on doing, and seeing Mitsuki’s class doing takoyaki, it all connected. Apparently, they were focusing on a takoyaki maid cafe. A normal maid cafe was very lucrative already, but takoyaki is a must-have on school festivals.

On a side note, Mitsuki’s cooking skill isn’t on the good side of things. Recently, she just bought a cooking book to learn from, trying her best to make simple things with clumsy skills. Meaning that she needed special training—which clearly boiled down to her working hard on making takoyaki at home like this, to prepare for the real deal.

As he stood next to his little sister, intensely glaring down at the takoyaki, Yuuya joined her, throwing the sizzling takoyaki an equally passionate gaze.

“………”

Mitsuki did not realize Yuuya’s presence in the slightest, carefully trying to turn over the takoyaki. However, she was unable to cleanly pull that off, and with clumsy hand movement, she messed up the dough. Every time that happened, she lowered her brow in a displeased manner. Watching that serious expression from the side, Yuuya was about to bust out laughing.

“—You’re still missing some oil here. Did you put enough on before starting?”

“?!”

As Yuuya gave Mitsuki a valuable tip, Mitsuki jumped up on the spot ever so slightly, and threw a harsh glare at him. She looked like a hostile cat, all her hair standing up straight.

“Wha—?! What?! Why are you here?! Since when?!”

“I did say ‘I’m home’ a few minutes ago, but you didn’t hear me because you were so busy with the takoyaki, right?”

“……Hmpf.” Mitsuki puffed out her lips, and averted her face.

“Anyway, we can still fix this sloppy takoyaki. Look, if we do it like this—”

As Yuuya took Mitsuki’s hand from behind, he used the pick to skillfully gather up the dough in the middle, giving his wrist a quick snap to turn it around.

“?!”

Mitsuki twisted her body as she was inside Yuuya’s arms.

“Ha…Ahhh…”

She narrowed her eyebrows, leaking out a sweet moan. However, Yuuya paid that no mind, as he kept holding onto her hand, giving her a lecture.

“If you manage to stab it deeply, and be able to cleanly turn around your wrist, you should be able to do it as well. But, most importantly is that you put enough oil in there to begin with.”

“…No, ah…Ahh…”

Mitsuki’s face turned red in a matter of seconds, as her body started to give off small spasms. To her misfortune, Yuuya was already too focussed on the takoyaki that he didn’t notice the heavy chance of his little sister’s condition.

“Ah…N-Noo…”

A heated voice leaked out of Mitsuki’s mouth, making Yuuya finally realize that something was off with her.

“Hm? What’s wrong, Mitsuki? Did I do something bad?”

“N-N-Nothing…Nothing at all!”

Inside Yuuya’s arms, Mitsuki averted her expression yet again, as her body stiffened up. However, her hand was burning hot, building up quite a sweat. Because of the sweat on her head, her hair was glued to her face, as her breathing grew more rough. The area around her eyes reddened up as well, and the second Yuuya realized that, his heart skipped a beat.

“I…Is that so…”

He tried his best not to pay it any mind, and focussed back on the takoyaki, but now that he realized the strange condition of his little sister, he couldn’t quite rid his head from that. As a result, even his own hands started to get sweaty.

“H-Hey…Your hands…are really sweaty, you know?”

“?! M-Mitsuki’s as well though?!”

“N-No they’re not!”

While going back and forth, akin to a small fight between siblings, Mitsuki’s body suddenly convulsed with an “Ah…” as she let out a feeble voice, which left Yuuya with a weird tingling feeling.

“W-What happened? Mitsuki, you’re acting a bit weird…?”

“N-N-No! Everything is just as always!”

She threw Yuuya a harsh glare yet again, but her eyes were watery, transmitting a certain amorous atmosphere. Feeling like he had done something perverted judging from that reaction, Yuuya froze up on that spot.

“Eh…Um…Ahh…”

Letting go of Mitsuki’s hand here would make things even more awkward, but keeping the situation going could invite some sort of bad incident. Although he didn’t go as far as thinking what exactly might happen, all he knew is that things would end badly.

“Ahhh…Mmm…”

A seductive voice coming from Mitsuki, as she used her free hand to close off her own mouth, her body shaking furiously.

“—Are you…Not feeling well? Your face is red, so what if you have a fever…”

“No…that’s…not…it……okay.”

Mitsuki started fidgeting with her thighs, her breathing rough, as she shook her head sideways.

“Then what’s wrong? Just tell me.”

“A-As if I could tell you!”

Yuuya flinched as Mitsuki suddenly barked at him. As always, he was unable to grasp what exactly was going on with his little sister. He was unable to read her reaction as per usual.

“Uuu…Uuuu…Why does…it end up…like this…”

Mitsuki grew teary-eyed, glaring at Yuuya over her shoulders, biting into her lip in a frustrated manner. Watching this reaction happen live in front of him, Yuuya swallowed his breath.

What is that reaction?! We’re not doing anything lewd though?!

All they were doing was making takoyaki together. Or so it should have been, but Yuuya was left clueless as to why his little sister was acting like she was in heat. Not knowing what to do in this situation, he just averted his eyes, only for his ears to react on a sharp “Haaaa…” sigh from Mitsuki, which sounded different from her seductive one seconds ago. As if it was meant for his ears. Yuuya showed a confused reaction, as Mitsuki whispered at him, her eyes filled with intended seduction.

“Aha, really, Onii-chan…doing this from behind…so bold…”

As if it was a completely different person, Mitsuki now let out a soft, teasing giggle.

“?! W-W-W-What?!”

“Ehhh? Even though you should know~?”

Her brusqueness was washed away like it was a fantasy, as Mitsuki laughed yet again. Seeing this sudden change, and surprising reaction, Yuuya was left in confusion.

“Takoyaki is good and all…But I’d like you to teach me lots of other stuff as well. Okay, Onii-chan?” said Mitsuki, as she let go of the takoyaki pick, tightly gripping Yuuya’s hand.

Her hand, drenched in sweat, was unbelievably soft, making Yuuya swallow his saliva.

“Teach you…more…L-Like what…”

In this situation, the one not getting any erotic ideas was clearly the weird one. To be precise, the Mitsuki inside his head just went “Teach me more perverted stuff, Onii-chan~” as she put Yuuya’s hand on her own chest, inducing an act that would leave them unable staying just normal siblings…Fantasies like these were filling his head at rapid succession.

Wait, as if something like that would actually happen?! She’s just my little sister after all!

He quickly shook his head to rid himself of these impure fantasies.

“What’s wrong, Onii-chan? Shaking your head like that. What were you thinking about just now?”

Flashing a cheeky smile, she pressed her cheek against Yuuya’s hand, giving it a strong lick.

“! W-W-W-Wha?!”

As the soft, and also warm sensation got in contact with his fingers, Yuuya was unable to hide his discomposure.

“There was some dough on your hand. Fufu, delicious~”

While licking Yuuya’s finger with her small tongue, Mitsuki narrowed her eyes as she spoke.

“?!”

All the while being bewitched by Mitsuki’s sudden change of behaviour, Yuuya was unable to calm down.

This…is definitely weird…!

As of recently, his little sister had been acting a bit weird—No, not just a bit. The Mitsuki that was always acting hold and moody would sometimes have a complete turn of events, acting like a spoiled child, actively seeking out skinship like this. Also, while he was normally being called just ‘You’ by her, when this change happens, her way of addressing him would switch to ‘Onii-chan’ instead. Although there was no end to his weirdness, the most decisive factor Yuuya could revert back to were those panties…

“Say…haven’t you been acting a bit weird recently?”

Before he even realized it, those thoughts just leaked out of Yuuya’s mouth.

“?!”

The moment those words reached her ears, Mitsuki’s face burned up even further. Although her usual displeased expression floated across her face for a mere second, it quickly reverted back to a mixture of anger and embarrassment, as she bit into Yuuya’s finger, softly whispering towards him.

“The reason I’ve gotten weird is all because of you, Onii-chan, you know?”

Mitsuki’s suggestive words reverberated inside Yuuya’s chest.

No no no, my fault…? It’s not meant in a weird way I’m sure, but…her surroundings just changed after the remarriage, that’s gotta be it. Right…?

“Do you want…to know the reason?”

“Well…Of course…”

While his little sister was softly biting on his finger, Yuuya was trying to look away from her, speaking up in a mumbling way.

“……”

Towards this way of phrasing things that made it sound like an incoming confession from Mitsuki, Yuuya tried his best to keep a calm head, but his heart was beating so fast he was worried that Mitsuki might be able to hear. But, that’s when it happened. Mitsuki just kept quiet instead of speaking up, her body starting to tremble.

“M-Mitsuki? Are you okay?!”

Yuuya tried to frantically check for her condition as he approached her, but…

“Not at all! I’m not fine in any way!”

Just when he heard that sharp scream of hers, Mitsuki bit down on his finger, which she had been nibbling on before.

“Ouuuuuuuuuuuuuuuuuuuuuuuuuuch?!”

The howl like an owner having been bitten by their own dog resounded through the Kanzaki residence.

*

“Really! Will you give it a rest already, Hiyori!”

Dashing into the bathroom of the house, Mitsuki tilted her gaze upwards towards the ceiling. Shortly after, a girl with angelic wings on her back appeared out of thin air. With fluffy, semi-long hair, and a big ribbon decorating that, the girl equally had a hand on her hip, flying mid-air as she looked down.

“Isn’t that my phrase?! Mitsuki you idiot! Good-for-nothing! Small breasts girl! It felt like the perfect chance just now between me and Onii-chan, so don’t get between us like that!”

“Shut up! You were clearly going too far Hiyori! He only taught me how to make takoyaki, and things suddenly ended up like that! No matter what you think about it, it’s clearly weird!”

“That’s just because you’re easily embarrassed by everything, Mitsuki!”

“Don’t just act like it’s my fault! What do you mean ‘Onii-chan’, huh?! Don’t just call him weird names!”

“Really, you’re so stubborn. What’s wrong with calling Onii-chan Onii-chan?!”

“Everything! Also, my family only consists of me and my mother…Not with some stranger like him!”

“Okay okay okay! I’ve heard that phrase enough times now! Let’s just check how much of the gauge we filled up with that, okay?”

The girl called Hiyori let her eyes flicker with excitement, as her mouth turned into a ω form, clinging to Mitsuki.

“Wha?! N-No! Stop…”

“Fu fu fu, don’t be like that, I know you enjoy this just as much. Anyway, let’s see…”

Not paying any heed to the resisting Mitsuki, Hiyori just flipped up her skirt without any remorse. Beneath her skirt appeared rather ungirly panties…A leather belt, connected with two metallic chains, covering up her most important part.

“See, almost a full tank! Since the TST can’t lie, you might as well just stop lying about it, and accept it. Really, why are you so dishonest, Mitsuki?”

Hiyori teased Mitsuki as she crouched down to check the heart gauge attached to the leather belt that she called TST. Inside this heart gauge, a liquid was filling up towards the top. A mere fragment of a second later, Mitsuki’s face turned bright red, even until her earlobes.

“T-This…isn’t my fault, okay?! It’s because you’re possessing me, Hiyori!”

“Hmmm? I really don’t think that’s all though? I mean, the gauge has been feeling more and more comparing it to the beginning~ And you should know it best yourself, Mitsuki~”

“…I-It’s just your imagination, okay?!”

“Okay okay okay~ Then, let’s just leave it at that~ Either way, it’s a good thing that the heart gauge fills up more easily~ Let’s be even more lovey-dovey with Onii-chan, and fill up the gauge even quicker~ Yeaaah!”

As always, Hiyori was too energetic for her own good, as she raised her hand into the air.

“…Don’t make it sound so simple. We’re siblings after…all…so this normally doesn’t happen!”

“No need to be so stiff about it~ You’re not blood-related, so it’s all OK~”

“…T-That’s not the problem…”

“But, Mitsuki, you don’t want to die, right?”

Hiyori pressed her finger onto Mitsuki’s lips, giving a faint snicker.

“If we aren’t lovey-dovey enough with Onii-chan, filling up the heart gauge, I can’t go to heaven. I told you that before, right? And it’s not just that, you might also die if we fail, Mitsuki.”

“……”

As Hiyori’s tone suddenly changed into a more threatening one, with a stern gaze, Mitsuki swallowed her breath. Seeing the normally innocent and simple-minded Hiyori act all mysterious like that was giving Mitsuki goosebumps. Her outer appearance was akin to a pure angel, carelessly gleeful all the time, but her true identity was actually a ghost currently possessing Mitsuki.

With her target of regret being Yuuya, who she had loved during the time she was still alive, she possessed Mitsuki in order to be lovey-dovey with him, clear up her regrets, and pass on. And, this TST is an item that reflects Hiyori’s gauge of satisfaction. Every time the gauge fills up, another step gets added on the stairs towards the Gate of Heaven, but the way is still long.

To make things worse, in the cases that jealousy or suspicion would be induced instead of happy feelings, it reacts to this negative emotion as well. Before, the gauge had turned pitch-black, inducing a high fever. Just remembering that, Mitsuki turned pale. If she doesn’t get more lovey-dovey with Yuuya, she will die—And no matter how much she tried to not think about it, it would always creep around in the back of her head. Basically, there wasn’t a ‘No’ choice for Mitsuki.

“That’s why, let’s work hard to be lovey-dovey with Onii-chan, okay?” Embracing Mitsuki from behind, Hiyori whispered those words into her ear.

The arriving hot breath tickled her ear, making her shoulders jump up ever so slightly. Watching this reaction, the corners of Hiyori’s mouth distorted into a teasing smile.

“So cute~ Mitsuki, you’re still sensitive from just now, right?”

“N…No! What are you talking about?! Hiyori you idiot! Idiot!”

“No need to be so embarrassed, really. I’m sure that Onii-chan likes sensitive girls as well~”

As Hiyori ran her fingers across Mitsuki, her body started to burn up, like she had just gotten out of a shower, sweating furiously.

“No?! H-Hey…What are you thinking?! My uniform will get drenched?!”

“You have a spare, right? Don’t sweat the small stuff, really. For now…just focus…”

Hiyori softly bit into Mitsuki’s ear this time, grabbing both her hands, and slowly moved them towards her reserved chest. And then, she made Mitsuki’s hands dig into her own, soft chest.

“Ah?! Mmm…?! F-Focus…On what?!”

“Isn’t that obvious? Don’t make me say it…Imagine the continuation from just now…Just think of my hands as Onii-chan’s…See…Onii-chan will teach you…lots of perverted stuff.”

“Mmm?! Ahhh…Don’t…be ridiculous…Hiyori, you idiot…Super idiot!”

The moment she gripped the hardened tips through the bra, an electric current ran through Mitsuki’s body.

As if…I could do that…This is way too embarrassing…I’ll die for real…

Gazing at her own embarrassing appearance in the mirror, Mitsuki’s body started writhing in agony. Her drenched blouse started sticking to her skin, her bra becoming transparent the more time passes. Unable to watch her own expression melt from the pleasure, Mitsuki tightly shut her eyes. However, that only helped in making her more sensitive to her other senses. At the same time, Yuuya’s appearance while teaching her how to cook takoyaki flew back into her head. His hand would softly massage her chest, while carefully taking off her blouse.

“Ah…No…Mmm…Don’t…look…”

A voice so sweet and seductive leaked out of her mouth, making her doubt for a second if she was the one who produced it, as she started blushing even more furiously.

“That voice just now wasn’t too bad! Let me hear more of your cute voice, Mitsuki~”

“No…ooo…No no no! Don’t…no more…”

Mitsuki was inside Hiyori’s arms, throwing a tantrum like a cat as she shook her head left and right.

“Fu fu fu, let’s see how long you can resist~”

Along with that singing voice, Hiyori went ahead to take off Mitsuki’s bra, only to keep fondling her chest after it has been exposed, pushing one hand of hers beneath Mitsuki’s skirt.

“Ugh…Uuu…I-I keep…telling you to stop! Ah…N-No!”

“Are you sure about that? Listen, it’s just an experiment, just training~ Look, imagine my fingers to be Onii-chan’s. Come on, say it. ‘Ahhnn…Onii-chan, you pervert…’!”

“Don’t unnecessarily dramatize it! I would never say that! Hiyori, you idiot!”

Hiyori completely ignored her pleas, as she moved Mitsuki’s fingers in between the gaps of the TST. Even though she didn’t want to, she imagined those fingers to be Yuuya’s for just a second—Only to quickly shake her head left and right. In the meantime, Hiyori pushed Mitsuki’s fingers even deeper into the TST. The moment her fingers entered the deeper part of her most important place, Mitsuki blanked out, only letting out a despairing scream.

“?! No! Stoooooooooooooooooop!?”

The same moment Mitsuki raised this scream of ecstasy, the gauge of the TST filled up completely, glowing in a strong light.

“Yeah, good good. The gauge filled up quite a bit~ Mitsuki, good work today~”

While kissing Mitsuki on the forehead several times, Hiyori patted her on the head, very pleased with the result.

“………”

Mitsuki just rested inside Hiyori’s arms, unable to even give a response. She really wanted to complain about her ‘Good work’ comment, but her lips wouldn’t listen to her anymore, unable to press out any words.

“Really, ending up like this…Mitsuki, you pervert~”

Although Hiyori most likely had no ill intentions with it, Mitsuki could only retort inside her heart.

Why do things always end up like this?!