public sex, train sex, tentacles, bathroom sex, handjobs, dom!Kurama, implied blowjobs
"I believe the commonly accepted practice is to offer the seat to your elders," Kurama said. Yusuke's grin only grew.
"That would require me to care what my elders think of me," he retorted. Kurama gave a soft snort of laughter.
"I see," he said quietly. There was something in his voice that sounded almost like a warning to Yusuke, but he shook it off. It was a long train ride; he'd probably trade with Kurama at some point. He just couldn't help fucking with him, sometimes.
Kurama took his place in front of Yusuke, reaching up for the handle above his head. He reached behind his ear, making a scratching motion, and that got Yusuke's attention.
"Kurama?"
"Hm?"
"Whatcha doin'?"
"Just an itch," Kurama said idly. Yusuke narrowed his eyes, but let it drop. All the shit Kurama kept in his hair, he probably did legitimately just have the occasional itch. Probably.
That presumption lasted all the way up until Yusuke felt the slightest tickle of something making its way up over the edge of his sock.
"Kurama," he said in a soft sing-song, trying to ignore the goosebumps that sprang up in the tendril's wake. "What are you doing?"
"Not a thing," Kurama responded, but Yusuke definitely heard the warning in his voice now.
"You can have the damn seat - "
"Oh, no." Kurama's smile was a slash across his face and Yusuke felt a chill go down his spine - and straight into his dick, damnably. He really was going to have to sit down and examine what it was about Kurama's sadistic side that did that to him. Later. Not now, when the vine - and it was almost definitely a vine - was slowly crawling higher up his leg.
"No," Kurama said. "I think I much prefer you seated." He leaned down under the pretense of setting his bag down, moving closer to Yusuke so he could whisper. "And if you make a commotion, we will be ejected from the train. We will have to call Keiko to retrieve us. And I will tell her exactly why."
"Bastard," Yusuke hissed between his teeth. "Overreacting bastard."
"Tell me to stop and I will," Kurama said, straightening back up. Yusuke glared up at him and said nothing. He was already half-hard in his pants, as the thin vine edged under the hem of his boxers, and the shiver that went through him stated his position perfectly well. Kurama just looked away, a smug little half-smile on his face, and Yusuke sat in his seat and seethed.
The vine crawled up and over his thigh, snaking over his skin and wrapping around his cock. His eyes drifted shut at the sensation, feather-light and sinuous, and he tried to mask the reaction by dropping his head forward and crossing his arms over his chest, mimicking sleep. The vine wrapped around his cock and squeezed, not tight enough to hurt but tight enough to make him react, cock jerking in his grasp and a sigh escaping Yusuke.
Gonna kill him, he thought, gritting his teeth against the next wave of shivers that washed over him. I'm gonna fuck him and then I'm gonna kill him.
As if it could hear his thoughts, the vine made a sudden corkscrew motion, engulfing his cock entirely. He made a choked noise that he managed to turn into a cough, taking a deep breath in through his nose as the vine began to move.
It wasn't sliding up and down the shaft, like he'd half-expected. Instead it was rippling, squeezing and releasing from base to tip in an undulating pattern that had fire curling in his belly with alarming quickness.
He was pretty sure coming in his pants counted as "making a commotion". Unfortunately that was exactly where he was headed, the way Kurama's vine was gripping him.
He cracked one eye open, surveying the train around them. Everybody was mostly minding their business, even the kids that would normally be staring all around them. They had no idea Yusuke was sitting there fighting for his dignity with every pulse of the vine over his cock. And he wasn't exactly being subtle, he knew what he must look like. All anyone had to do was look over at him and they'd know. Something about that, the danger of exposure, made another shiver run through him and his head dropped back against the window.
He had no idea how much time had passed. He wasn't aware of much except the pressure around his cock and the way they sat on the knife's-edge of discovery. He was close, dangerously close, and he knocked his foot against Kurama's as a warning, the only kind he had. If he opened his mouth or even unclenched his jaw something truly filthy was going to come out.
"Soon," Kurama murmured. "We're almost there. You're doing very well."
Yusuke shivered hard, mentally flinging every curse he had at Kurama and inventing a few new ones for good measure. That was cheating and Kurama knew it.
Whether it was genuine mercy or Kurama just didn't want to deal with getting thrown off the train, the vine held still. Only after a moment Yusuke realized that was almost worse, his throbbing cock craving friction, motion, anything besides the maddening jostling of the train. He almost cried when they pulled into the station, scrambling upright as Kurama's vine retracted back down along his leg.
"Bathroom," he growled under his breath. Kurama said nothing, only smiled, but followed behind Yusuke as he charged off the train and into the station.
Crammed together in a single stall, Kurama wrapped one arm around Yusuke's waist from behind and used his free hand to pull his cock out of his shorts. Yusuke almost cried at the feel of skin on skin, Kurama's firm grip around the base of his cock.
"Have we learned manners?" he murmured in Yusuke's ear.
"Yes, fuck, whatever, Kurama." He hated the whine in his voice, that he was just this side of begging. But Kurama's grip only tightened, his hand not moving, and Yusuke tried to wrap his hand around Kurama's and make him move. But Kurama held firm, his arm tightening around Yusuke's waist.
"Will we be polite next time?"
Yusuke's next breath was a full whine, Kurama's name somewhere in the exhalation. Kurama just chuckled. "I suppose that will have to suffice as an answer."
It only took two hard pumps of Kurama's fist before Yusuke's head dropped back against his shoulder, a cry muffled behind clenched teeth as he spilled over into Kurama's hand. His cock pulsed with it, relief melting into every cell of his body as he practically collapsed in Kurama's arms.
"Fucking hell," he muttered, breathless. "Remind me never to really piss you off."
"Who said I was angry?" Kurama laid a gentle kiss behind Yusuke's ear. "It was a long train ride. I wanted entertainment."
"...I'm going to kill you once I can move my legs again," Yusuke threatened.
"Noted." Kurama turned Yusuke around by the shoulders. "Thankfully you don't need your legs for this."
"What are you - " Kurama took his hand, pressing it to the front of his pants. His cock was a hard, hot line straining against the fabric, and Yusuke swallowed hard. "Ah."
Kurama pressed on his shoulders, encouraging him to his knees. "My turn."
