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Disclaimer: I don't own Tokidoki Bosotto Roshiago de Dereru Tonari no Alya-san or any of its characters...
"Onii-chan… harder…! H-Harder…!"
Yuki moaned louder with every thrust into her, accompanied by her tongue rolling out of her mouth and her drool forming a little puddle on the sheets.
She was on Masachika's bed, completely naked, on her knees, while her brother was pounding her from behind.
"Should I just expect you to come by every night? Even when I'm already asleep?" he frowned in confusion, pulling on her arms while he moved in and out of her like a piston.
Masachika was a lot more intense than usual this time but from the look of bliss on his sister's face, she didn't mind it one bit.
If she could see the look on his face, she'd see the frown that he bore at the moment… he wasn't angry with her, but it's clear that he was bothered by something, and that feeling was being translated into his movements.
"I-I'm sorry… but I couldn't help it, Onii-chan…" she smiled perversely, unable to contain her happiness at being able to do this with the person she loved on a regular basis.
"I'm starting to think that you're only doing this because I'm the only guy here…"
"H-How could you even say that, Onii-chan…?"
Yuki slowly turned her head to look at him with eyes full of love, even though she was already nearing exhaustion from their lovemaking.
"Remember what I said? I love you more than anything else in the world."
Her expression snapped him out of his angry state and caused him to slow down in his movements, something that Yuki noticed right away.
"Sorry… it's just that Taniyama… she got on my nerves earlier…" he confessed, stopping for a moment to get his mind back on track.
"I had a feeling that something happened between the two of you, but can it wait? Just focus on me, Onii-chan…" she pleaded while getting back up on all fours.
Realizing his sister was right, he sighed and shook his head to rid himself of those thoughts for now.
"You're right… I shouldn't be thinking about her that much. It'll just bother me even more."
His mind free of those hindrances, Masachika turned his complete attention towards Yuki and resumed his actions, only without his earlier vigor and intensity.
"C-Can you go harder like earlier, Onii-chan?" asked Yuki, immediately finding herself missing the ferocity that Masachika possessed earlier and wanted it again.
"What? But I wasn't myself—"
"Harder! I want you to go harder, hurry!" she cried, shaking her bottom to try and entice him.
"Hey, watch your mouth! Are you trying to get us caught or something?!"
Acting out of impulse, Masachika gave her a loud smack on her butt to silence her. While it had the intended effect in making Yuki quiet (apart from a soft gasp of pleasure that escaped her lips), he immediately realized what he did and regretted it.
"Uh, I-I'm sorry, Yuki…! I didn't mean to hurt you like that…" he apologized, fearing the possibility of his sister crying again. "Damn it! Uh… does it hurt? We can stop if you want…"
However, his words fell on deaf ears because Yuki wasn't listening at all… she was completely focused on the fact that her brother just smacked her on the butt… and the sensation that it brought her afterwards.
Little did Masachika know… that he just caused something to awaken in his younger sister with his action.
After yet another pleasurable and rather enlightening lovemaking session with Yuki (the fourth one in six days), both siblings sat by the edge of the mattress, where Masachika explained what happened between him and the council's Public Relations Officer earlier that nearly descended into another conflict.
"So, Taniyama-san is suggesting that we should leave Alya-san alone?" Yuki muttered after hearing everything her brother had to say.
"—yeah, because she thinks Alya's going to cause trouble down the line. The nerve…" he grumbled in displeasure.
"Don't take it the wrong way, but Alya-san's current demeanor doesn't really help her case, Onii-chan."
"Then I'll fix that. I'll apologize to her and things will finally be alright. She'll be back to normal and we can focus on getting out of this godforsaken island again."
She smirked, "And here I thought you don't care about getting home, Onii-chan…"
Masachika groaned. "Like I said before, I wasn't serious. It's more important for everyone to get back to Japan safely."
"Haha, I'm not looking forward to that!"
"What?"
"There's nothing back home that I miss, simple as that. I actually don't mind if we start living here like a married couple~" she cooed, wrapping her arms around him in a loving hug.
"Seriously?" he asked, unable to believe that Yuki would even say such words.
"Onii-chan is here with me, and that's all I need. We even took our relationship further while we're here, and there's nothing that anyone can do about it."
Yuki can't be telling the truth, right? This has to be some joke that she's trying to put on because it just sounded too ridiculous to be true.
"...are you sure you haven't lost your mind yet? Everyone else is doing their best to get off this island, even Ayano, while you're telling me that you want to get stuck in this place."
Yuki flashed him a beautiful smile, one that conveyed a lot of emotion underneath. "If I was really crazy, then I wouldn't have been able to show how much I love you, right?"
"Nnghh…" he looked away in embarrassment, still not used to hearing those words from her mouth.
"—or maybe I should start acting as the yandere sister who would kill other people that dares to go near her Onii-chan~ How's that for crazy? Mwehehehehe!"
Masachika chopped her on the head, stopping her from continuing her embarrassing monologue, and causing Yuki to cry out in pain.
"Muuu… I guess you still don't think I'm being serious about my feelings," she puffed her cheeks and pouted afterwards. "Even after I poured all my emotions into my confession and then fucking my brains out several times now?"
"Please don't remind me of that last bit. I still feel like I'm committing an unforgivable sin."
"But that's the best part," she pointed out without a hint of shame. "Giving my forbidden cherry to my one and only Onii-chan, the person I love the most in the entire world… hmm, I'm getting wet again~"
"Shut up already, you horndog."
"Hehe, did that make you hard?"
"I said shut it!"
Masachika palmed his face and groaned, if only to hide the redness on his cheeks. This girl didn't have a filter, and it was getting harder for him to keep up the strong facade.
Thankfully, she didn't say anything else for a while, which allowed him to gather his thoughts to himself.
"Look, Yuki… I acknowledge your feelings," he admitted after taking a moment to process everything. "As crazy as it is, I understand where you're coming from and I get it. But even so, it's not like we're dating. Scratch that, we can't even date each other."
"Is that so? Then Onii-chan, if I asked you, would you date me?" she asked, not even fazed by the crushing truth of reality.
"I literally just gave you my answer."
"Can't you just humor me, Onii-chan? Come on, it's a simple question."
"No, obviously."
"And why is that?"
"Because we're siblings, you dummy!"
"Siblings don't fuck like rabbits in heat, Onii-chan. Don't you think we're way past that excuse by now?" she snorted.
"What excuse? It's just how it is."
"You're saying that it's not right for siblings to date but it's totally fine for them to have sex~?"
"Yuki…" he spoke in a dangerous tone, serving as a warning to her about continuing on with this ridiculous tirade.
"Look, my point is, who cares if we start dating, Onii-chan? It's not like we're going to tell everyone that we're together… unless you want to, of course. I'd like it if you say that I'm yours in front of Alya-san~" she giggled, casually laying herself on top of his lap while kicking her legs back and forth.
"An incestuous relationship is unacceptable in society's eyes and you know that."
"What society? We're in the middle of the ocean, remember? There's no one to judge our relationship in the first place."
"Well, it's not the only problem. An inbred child between two blood-related people, especially siblings , has a huge possibility of— FUCK! I've been doing it inside of you!"
A look of horror took over his face along with that realization, while Yuki cackled like a madwoman at his reaction.
"Bahahahahahaha! It took you this long to realize it, Onii-chan?!"
"This is not something to laugh about, Yuki! What if you end up getting pregnant?" he scolded her for her carelessness right away, but the girl didn't seem like she was bothered.
"Oh, lighten up. I don't really feel sick or anything, you know?"
"Being aware of the risks of pregnancy would have made all the difference in the world, you little shit!"
"Jeez, what are you so mad about, Onii-chan?" Yuki waved off his concerns again. "I wouldn't have minded it if I ended up being pregnant~"
"That's not an issue that you can simply brush aside. Pregnancy is a very serious thing that can affect entire lives."
"I'll tell you when I care," she waved off his concerns in a nonchalant manner. "Now back to my original question, since I proved your worries wrong … wanna start dating, Masachika-kun?"
"She's not taking this seriously…" he sighed in defeat.
Yuki laughed at the defeated expression on his face, "Don't worry, Masachika-kun~ you don't have to answer right now. I just wanted you to think about my question. Heehee~"
"Yuki…" Masachika was about to scold her once again, only for him to hold back and focus on the more important thing. "What exactly are you planning here? Honestly."
It was clear to him that his sister had something to gain from all this, which he realized after Yuki started coming to his room to do this almost every night, and only got affirmed with her nonchalant attitude at the moment, but he was uncertain as to what it is.
"Oh, don't worry. I'm not going to cause trouble for you, Onii-chan. Honestly, I'm perfectly fine with how things are right now. I wouldn't mind doing this everyday with you~"
"Do you really expect me to believe that you've been coming here just for sex and to satisfy your own messed-up feelings for me?"
"I have no reason to lie, Onii-chan. As long as you're here with me, I don't care about anything else."
Yuki then got off his lap and stood in front of him, stretching her arms out for a bit before turning around with an eager grin on her face.
"—but I can already tell… that everything is going to change soon."
"Are you talking about Alya?"
"Hehe, mostly. In truth, I was talking about everybody. Alya-san, Masha-senpai, Taniyama-san, Miyamae-san, Sarashina-senpai, even Ayano."
He frowned in confusion. "Huh…?"
"You noticed that we've managed to find a stable and steady rhythm for how we spend our days here, right?"
"Yeah, so what?"
"Well, what if something were to happen that disrupts that rhythm? What if the temporary peace we came up with suddenly ended, Masachika-kun? Think about it."
"That already happened with Alya, idiot."
"Do you really think that? Because in my eyes, Alya-san was just the beginning of it and what you told me about Taniyama-san will only lead to the next act ."
"The next act?"
"Mmhm, and then eventually… everyone here will start seeing Masachika-kun for the amazing person he is~"
She turned around and walked away with her hands behind her back, but it didn't really make things clearer for her brother. In fact, it made him more confused, especially when she mentioned him at the end.
"Now you've lost me. How exactly am I involved in that?"
Yuki turned around slightly to show him the look of excitement on her face, as she began giggling to herself.
"You'll see for yourself, Onii-chan. I can tell things are gonna be more fun from now on, so look forward to it~!"
MINASAN, YONDE KURETE ARIGATŌ! AISHITEMAAAAASUUUUU! *starts playing air guitar*
-Lance