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“Are you trying to seduce me right now?” Senku asked incredulously. Well – only slightly incredulously. The truth was he wasn’t surprised in the slightest; Gen was known for pulling these kinds of tricks, but usually only on others, usually only when he was trying to get something in return. But they were roommates; Senku wasn’t entirely sure what his friend was thinking now.
Gen gave him an easy smile. “Seems that it’s working, don’t you agree?”
Senku scoffed, turning his back on him to reach for the doorknob.
That was his first mistake.
In a flash Gen had grabbed him by the shoulder and wrenched him back around roughly, slamming him against the closed door with a force that surprised Senku into silence, eyebrows shooting upward and mouth slightly agape.
“What are you—”
“You think too much.” Gen gradually slid his hands from Senku’s shoulders to his chest and eventually found his necktie, which he began to undo with a teasing smile. “Let me help you with that.”
Senku swallowed. Okay, so…maybe Gen did want to be more than friends after all. He stood completely still as the two-toned man pulled his tie free, then gently grabbed both wrists and pressed them together, beginning to wrap the fabric around them.
“Gen—” For a brief moment, Senku felt a jolt of panic. What was he doing? Five minutes ago they’d just been good friends about to go have dinner in the cafeteria, and now Gen was trying to tie him up to do god knew what? He tried to pull his arms free, but Gen held him in place and looked up to meet his gaze, stilling his own hands in the process.
“Relax,” Gen said gently, finally managing eye contact with the scientist. “Trust me.”
Senku hated to admit that his heart was racing. It was all he could do not to shake from the sudden nerves. But despite himself he did trust Gen, so with a shuddering breath, he nodded slowly.
Gen made quick, easy work of tying his wrists together with his own necktie. Then he pushed his arms above his head and took one more step – officially entering his personal space.
It started – as Senku supposed all of these encounters did – with a kiss. Gen’s lips were soft on his, oh so gentle, tasting slightly of cherry. He barely had time to enjoy it before he was moving on, pressing a kiss to his cheek, his jaw, and finally his neck.
Dang it, Senku thought as he bit his lip to keep himself from making any noise. Of course he would go for my weak spot right off the bat.
“Come on, Senku,” Gen murmured against the space where his neck met his shoulders. “I know you have it in you. Don’t hold back.”
“What are you talking about?” Senku tried, but then Gen cheated and used his tongue, and the scientist almost wanted to curl up and hide for how loud he moaned. Almost. “Ungh, Gen…”
Gen chuckled, switching back to regular kissing. “There you go.”
“Y-You…how did you know…?” Senku’s voice was coming out uneven now, laced with sounds he didn’t entirely know how to describe.
“Please. You don’t give me enough credit.” Gen grasped both of Senku’s wrists in one hand and slid his other down his body to his chest, rubbing it gently.
Senku’s breath hitched, and his body reacted without his permission, arching into Gen’s touch further, tilting his head to allow him better access. “Gen, I…”
“Shh.” Gen kissed his lips again. “Stop talking. Just relax.” Then he pulled his hand away from Senku’s chest and leaned back to meet his eyes. “Now, are you going to keep your arms up for me?”
A shiver ran through Senku. He was sure he was visibly blushing, though there was nothing he could do about it. He swallowed again, nodded once.
Gen let him go, but Senku didn’t move. He stood there with his arms bound by his own tie, keeping them above his head as his roommate quickly removed his own shirt and then reached forward to begin undoing the buttons on Senku’s.
The act was so simple yet so intimate. Senku’s eyes widened. His heart pounded in his chest. By the time the last button was undone and his shirt fell open, he couldn’t keep his arms up anymore. He brought them down and tried to say, “Gen—” But the mentalist merely grabbed the strip of extra fabric binding his wrists together and pulled him away from the door, locking it in the split second before shoving the scientist over to his bed and forcing him to sit.
“Gen, I’m not…I’ve never…” Senku attempted, but Gen shushed him again.
“I know, Senku. It’s okay.” He tugged on the bindings to pull his roommate closer to him. “I want to help you. But I don’t want you to freak out if you’re not ready. So is this okay? Do you want me to?”
Senku met Gen’s eyes and knew even before seeing those beautiful blue orbs what his answer would be. “Yeah. Just be gentle with me. I’m a delicate flower.”
Gen snorted, kissed him, and pushed on his chest to force him to lie down, quickly climbing up onto the mattress to straddle him and shove his arms above his head again. “Sure you are.”
Senku was surprised but didn’t protest when Gen bound his wrists to the headboard, leaving him completely helpless with both of his roommate’s hands free to do as they liked with him. Still, he couldn’t help but feel excited when he gave a gentle tug and couldn’t move his arms at all, even as Gen ran his fingers down his inner forearms to his shoulders and chest, leaning down to kiss him again.
“You sure?” he asked softly, sincerely.
“Yes,” Senku affirmed, and this time it was a breathless plea for more. “I’m sure.”
Gen needed no further invitation.