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Disclaimer: I don't own Tokidoki Bosotto Roshiago de Dereru Tonari no Alya-san or any of its characters...
Both siblings' gazes were drawn towards Alisa now, and they were so intense to the point that it made the silver-haired girl gulp in nervousness.
"I-I'm not…"
"Eh? Then what's with the nervous look?" Yuki asked, walking in a circle around her several times until she snapped her fingers in realization. "Oh, I get it… you must be having a flashback at everything that happened last night, huh?"
"N-No! I… am just surprised at how this argument between you both could become so intense…"
Without Alisa realizing it, the other girl was suddenly behind her. A loud yelp escaped escaped her mouth afterwards when Yuki groped her ample mounds and squeezed.
"Kya—!"
"Seeing your squirming face the whole time was really cute and funny, but I guess I did go a little hard on you…" Yuki grinned, fondling the girl's boobs. "I think you actually came a lot more because of me than Masachika-kun, hehe~"
Masachika sent his sister a deadpan look, "You went overboard on her, I can tell you that."
"Well, she looked so scared of me, so I had to calm her down somehow…"
Alisa lowered her head in an attempt to hide the embarrassed look on her face, both from remembering the previous night's events as well as Yuki's actions right now.
"Wait a second… don't tell me you're actually afraid of something else, Alya-san?"
"What are you talking about, Yuki?"
Ignoring her brother for the moment, the girl leaned closer to Alisa's face and flashed another wicked smirk that showed just how much she was enjoying this.
"Did it really have that much of an effect on you? Seeing me with Masachika-kun? In the position that you thought was reserved for you?"
Alisa bit her lip to try and suppress the noises that were threatening to leave her mouth again, but it was becoming increasingly difficult. She wanted to break free from the other girl's hold on her, but the look on Yuki's face made her think twice about her intentions.
"Nnngghh…"
"As I said, Alya-san. You don't have to be afraid of me. I'm not so cruel that I would separate you from Masachika-kun altogether," Yuki reassured her. "But I want you to know that you're not the only one who matters. You were never the only one who mattered, got it?"
She pressed her fingers down on the girl's mound even while she was still wearing a shirt, drawing a louder moan from Alisa. By now, the latter's face was so red from shame that it resembled a boiling tomato, but Yuki kept the pressure on her.
"As long as you know your place, Alya-san… nothing bad's going to happen to you. After all, our master over there was willing to forgive you after everything you did. I forgave you too, so don't worry about losing your place in this whole arrangement entirely. Although, I definitely wouldn't mind seeing you beg~"
Yuki finished her entire statement by whispering it into her victim's ear, sending chills down her spine as a result. Alisa couldn't hold back the urge to moan this time, as she finally uttered a proper response to all this.
"I-I don't understand it… I don't get myself at all… it feels like I'm about to go insane, but…"
The girl bit down on her lip harder, before she gripped the waistband of her shorts and pulled it down, revealing her panties that was already drenched with her juices.
"I don't care that… I'm not the only one you care about, Masachika-kun… as long as… I'm with you… as long as I'm by your side…"
Masachika raised an eyebrow at that statement, finding it strange that Alya would say such a thing when he was painfully aware of how she's like when she's jealous of someone, especially if that someone was Yuki.
"I-I'm not the only one in your heart, but… I didn't think that way, so please… don't hold back."
The nervous expression on her face conveyed her conflicted feelings but at the same time, it seemed like Alya was forcing herself to say these things out of an innate desire to stay with the young man.
Her lips trembled, but Alya continued to speak in spite of it. She even showed off a smile, as best as she could at least.
"Y-You can p-punish me for it, Masachika-kun… until I lose my mind…"
"Is that so~?" The smirk on Yuki's grew wider upon hearing those words. "Onii-chan, I think Alya-san's finally ready for the next step!"
"Next… step…?"
While Alya was confused beyond belief at what was happening, the two siblings shared a knowing glance, their minds seemingly in sync regarding what to do.
Yuki giggled, "Oh, you're gonna love this little gift that I have for you, Alya-san~"
Masachika smiled to himself, a look of satisfaction etched on his face upon getting a good look at Alya's current position. Again, he didn't generally think of himself as someone sadistic but strangely enough, this was putting a smile on his face.
Maybe Yuki's words about him being frustrated with Alya's attitude before were true after all, and this was his payback.
She was lying on top of his dresser, with her head and lower body dangling over each side. Her hands were bound underneath using her own shirt, preventing her from using them. Lastly, her panties and shorts were used to tie her ankles to the wooden legs.
The girl was attacked from both ends by her two equally-bare captors; Masachika kept her head in place with his hands as he invaded her mouth with his erection over and over, while Yuki held on to her thighs as she licked and sucked on the beautiful wet slit before her eyes.
"Nnggh… gaahh… mmff… aahh~"
The grunts and moans that came out of her mouth every time he moved were like music to his ears, and it fueled his desire for her even more.
And it wasn't just him.
"You're really amazing, Alya-san. It's been over an hour and you're still so wet down here~" Yuki smiled, licking her lips as she happily continued to eat Alya out.
"I didn't think about it much before, but now I'm sure of it. Alya's a masochist like you, Yuki."
"Mm, that's good to know, Onii-chan. Because we'll be getting along much easier from now on~"
Masachika sighed, "I think it's reasonable to say that you saw this whole thing coming. You even made a collar for Alya just like yours."
His eyes darted towards the leather collar that Alya now bore on her neck. It was the same kind that Yuki also had around her neck and even had a leash connected to it.
"I saw this coming? That's impossible, Onii-chan. It's not like I can see the future!" Yuki laughed and shook her head at how ludicrous her brother's statement was."I just prepared accordingly if there ever came the time where Alya-san would join us in doing this~!"
He rolled his eyes at her, knowing that Yuki was most likely joking around again, before turning his attention towards Alya instead.
"Still… who would have thought you'd be so into this, Alya? Because I still remember when you were the one who kept on prattling about going home. What happened?"
Smirking in satisfaction, Masachika pulled out of her mouth for the moment so that Alya could respond properly.
"I… I don't care anymore…" she breathed out, looking up at him with lust and joy in her eyes. "Being with Masachika-kun… is all that matters to me… I don't care about going home…"
"People change in the blink of an eye when faced with a situation like this, it seems…" he remarked before burying his rod into her mouth again, and she complied by doing her best to suck him off. "I'm getting close, Alya. Prepare yourself."
"Hmm~ looks like you're not the only one who's reached their limit, Onii-chan."
Yuki's words served to reinvigorate her brother, causing him to pick up the pace and go faster than before. She followed his example and lapped up the fluids around Alya's wet entrance eagerly, bringing her face closer to the latter's sacred place.
Through their actions, the two easily brought Alya to her climax; her voice was muffled because Masachika's erection remained inside her mouth, which also meant that she had to swallow everything from him.
On the other hand, Yuki giggled at the juices that squirted out of her throbbing entrance, before continuing to dig in like it was a delicious meal. It seemed like she was enjoying this for what it was and for as long as she could.
"This is so shameful… but I can't do anything at all," Alya thought while breathing heavily, the toll of being prey to the two siblings now taking effect.
At least things would be over now… or so she thought.
"Well then, time to continue over here."
Pulling out of her mouth, Masachika didn't waste any time and walked over to where Yuki was, as his sister happily moved aside to let him take her place.
"Eh…? W-We're not done…?" Alya asked, doing her best to gulp down the white stuff that remained in her mouth because of her current position.
He raised an eyebrow at her while spreading her legs slowly, "Why would we be done? I don't recall us stopping right away the previous times that we did this, Alya."
"T-That's because—"
Ignoring whatever statement that was supposed to come out of her mouth, Masachika went on ahead and pushed himself into her waiting entrance.
"Aaahhnn!" Alya moaned out as her mouth fell open, unable to hold herself back this time. Her sacred place was still incredibly sensitive from the orgasm she experienced, and he gave her no time to recover.
Masachika turned towards his sister next, who looked eager to be part of this in any way possible.
"Yuki. Do me a favor and clean her face with your tongue."
She licked her lips in delight, "With pleasure~"
Wasting no time, Yuki quickly positioned himself right in front of the silver-haired girl, where she chuckled in amusement at the look of pure bliss on Alya's face.
"Y-Yuk—"
"You can calm down, Alya-san. I'm not going to hurt you," was all she said before planting her lips on Alya's, beginning a clash of tongues between them in which she easily won. "Mm… it tastes just like Masachika-kun~
Alya blushed deeply out of embarrassment, so much that she tried to ignore it at first, but she was too helpless and powerless in her current position to do anything.
In the end, Yuki had her way with the poor girl and enjoyed the combined taste of Alya's tongue and Masachika's leftover essence… at least until her brother called out her name again and causing them to separate.
"And Yuki, you're next once I'm done with Alya. Don't think I'll be letting you get away with the stunt you pulled on Ayano without any repercussions."
"Of course. I know you're looking forward to punishing your cute little sister, Masachika-kun~" she purred, blowing a kiss at him.
Rolling his eyes at her playful attitude, Masachika turned towards his main target once more, who was trying hard to catch her breath.
"Try not to be too loud, Alya."
Before she could even get a chance to respond, Masachika pulled out until it felt like the tip was the only thing left, before pushing back inside.
This became the rhythm that he followed for the minutes that followed, while Yuki focused entirely on keeping Alya quiet by occupying her lips. She even helped herself to the bountiful chest that belonged to the beautiful student council president, squeezing and kneading the mounds to her liking.
Masachika continued to move until he felt another climax approaching, to which he kept himself buried inside her once it came. Alya let out a muffled scream as a result, which Yuki took pleasure in hearing.
After coming down from his high point, the young man pulled out of her sopping wet entrance. He took a few deep breaths to recompose himself before setting his sights on his younger sister.
"Oh, it seems that it's my turn now, Onii-chan~" Yuki immediately shifted her attention to her older brother, leaving a nearly-unconscious Alya behind and approaching him instead. "I wonder what you have in store for your cute little sister— hngrk!"
A choking sound escaped her mouth and cut her off midway through her question. Before she knew it, she was pulled towards Masachika through the leash on her collar.
"Heh… I see that you're not in the mood to play games, Onii-chan…" Yuki grinned.
"You're right," he tugged on the leash harder, forcing her to raise her head even more. "I'm tired of your games, Yuki. I've had enough of them for one day."
Masachika used it to lead her to the bed, where he ordered her to get on all fours. Yuki happily complied, getting into position with her brother before wiggling her butt at him in an enticing manner.
"Why don't we show Alya-san how siblings get freaky, Onii-chan?"
That question only served to irritate him even further, as a matter of fact. He grabbed her hips with such intensity, squeezing down on her soft skin before slamming himself into her in one strong thrust, catching Yuki off guard.
"NHAA— ack!"
The loud squeal of pleasure that was about to come out of her mouth was cut short because Masachika immediately pulled on her leash, causing her to choke on her voice.
"You were enjoying yourself a little too much back there, Yuki. Now it's your turn to stay quiet."
Smirking at the strangled look on her face, he resumed his movements while continuing to pull on the leash, leaving Yuki in a state of both pain and pleasure at the same time.
With every thrust he made, a choked gasp would leave her mouth and it even reached the point that a small puddle of her drool would form on the sheets.
By the time that Alisa was fully conscious again, she realized that she was still tied to the dresser underneath her with no chance of being able to move.
While in this position, all she could do was turn her head to face the bed where the two siblings were still in the heat of their shared debauchery.
Masachika held his sister by the arms as he continued to pound her from behind, while Yuki bore a blissful expression on her face, loving every second of being treated like a ragdoll by her brother.
"Ah! Ahh! Ahhn! So… rough… so… good… inside…!"
It was a very similar sight to the scene that she witnessed the night before but this time, Alisa couldn't look away even if she wanted to.
All in all, it was a night that neither of the two would forget.
"One, two, three~"
Both girls knelt in front of the young man on the bed, prostrating themselves willingly before him and leaving Masachika in a state of confusion.
After he was done with Yuki, Masachika freed Alya from her restraints and allowed the two girls to rest their bodies before promptly telling them to get dressed once they've rested enough.
Yuki complied as soon as she felt that she can move again, approaching Alya and making sure that the silver-haired girl was fine. It also seemed like they were talking about something, but Masachika had no idea what it could be about because he was putting on a new set of clothes.
…this must be a product of what they just talked about.
"...what are you two doing?" he asked, raising an eyebrow.
Yuki raised her head ever so slightly, but only to take a glance at him. "Doing what we're supposed to do, of course."
"We just finished. Don't tell me you're still up for more when you almost fainted a while ago."
"But you said it yourself, didn't you? We belong to you, Onii-chan."
"Yeah, so what? You both know that already."
"If we belong to you, then it's only right that we do this for you. You made Alya-san do this, didn't you? You made her bow like this, right? You wanted her to pledge her heart, mind, and soul to you, Masachika-kun."
He rolled his eyes at her, "Stop being silly. It doesn't mean anything big. Just follow what I say and that's it. You don't have to do anything else."
"Are you… tired of me, Masachika-kun?" Alya asked, slowly raising her head as she looked fearful of what he might have as an answer.
Masachika frowned. "No, what the hell even gave you that idea?"
Her lips trembled in fear, while her eyes looked like they were about to shed tears. "Am I not… useful to you anymore…? A-Are you… going to throw me away…?"
"Hey, what's—"
"Like I said, Onii-chan…" Yuki cut him off, while patting the other girl's shoulder in an attempt to comfort her. "She pledged her heart, mind, and soul to you that night. Alya-san gave herself up to you completely because you saved her and now you're going to tell her that her life isn't in your hands? What about me? Are you going to tell your sister the same thing?"
"I said that it didn't—" he tried to reply to her words, only for his response to fall apart midway through his statement.
Yuki gave him a question that he had no answer to, mainly because he had no idea what to say.
In the end, this would also be a night that Masachika wouldn't forget, as he was finally hit with the realization that he was carrying a lot more on his shoulders than what he intended.
And those are the lives and sanities of two of the most important people to him.
MINASAN, YONDE KURETE ARIGATŌ! AISHITEMAAAAASUUUUU! *starts playing air guitar*
-Lance