Locked inside a room, Otori and Hoshitani stare at each other for a minute. Then Hoshitani tackles him, pinning the older onto the couch, practically straddling him.
"Uh... Hoshitani?" Otori nervously asks, looking up at his kohai, who's staring at him intensely, like a cat who just caught the canary. Hoshitani smiles, "I really like you, senpai. After I graduate, I'll come after you, and never let you go again." Otori blinks, then smiles nervously, "You can't be serious."
Eyes slightly narrowing, Hoshitani still smiles, cocking his head to the side, "I'll show you then," he kisses the older on the lips then backs off, "That's how serious I am about this." Otori stares back in shock at what just happened.
Hoshitani, still on top of his senpai, smirks, kisses Otori again, then, unexpectedly, feels Otori kiss back. Hoshitani smiles into the kiss, then they part, catching their breath. He looks down at his senpai with a smile, said senpai smiling up at him.
"Since you've been a bad boy, I guess I'll need to punish you, Puppy," Otori smiles confidently. Hoshitani raises an eyebrow at him, "Oh, really~? I'd like to see you try." Otori takes that challenge, wrapping his arms around Hoshitani's neck, pulling him into a kiss. Hoshitani moans in response to it, Otori flipping their positions, then parting for air.
Otori smirks down at his kohai, his hands on Hoshitani's cheeks, "Now, be a good boy, and let me tame you." Hoshitani blushes, nodding at the idea of being Otori's pet. Petting his new pet, Otori smiles in satisfaction, Hoshitani leaning into his touch.
"I like you too. Would you go out with me?" Otori asks as he continues his petting. Hoshitani smiles up at him, beaming, "Yes." They both smile, then seal it with another kiss.
Bonus:
"Now then, about punishment," Otori smiles evilly. Hoshitani panics a little, then tries to escape. Otori grabs his wrist, pulling him back, "Where do you think you're going?" Hoshitani struggles, "Sit and stay, Yuta." Yuta obeys him, "Yes, Itsuki." Itsuki smiles, pulling Yuta into his lap, laying him down on his stomach, then pulls down his pants and boxers, exposing his bottom. Yuta flinches then yells, "D-don't!" Itsuki then proceeds to spank Yuta ten times, Yuta yelping and arching his back every time.
When Itsuki was done, Yuta's bottom was bright red as well as his face. Itsuki pulls his pet's boxers and pants back up, letting Yuta sit up, but still in his lap. "Promise not to do that again, Puppy?" Itsuki asks. Yuta whimpers, feeling his sore, raw bottom, "Y-yes. I won't do it again, Master." Itsuki smiles, and rewards his Puppy with a kiss, then pets his hair, said Puppy leaning into it.
Itsuki whispers in his pet's ear, "I'll ravish you later." Yuta blushes at that, but smiles, eager for some love.
As for who put them in there in the first place... that's a secret.