While Flynn's area of expertise is kissing, Yuri is better at other acts involving the mouth.
It angers Flynn. For him to admit Yuri is better than him at something when all his life he and Yuri have been competitive equals… is nearly impossible. But he can't deny Yuri is good at this, at pleasuring him with tongue and lips alone. Flynn's anger is the half-hearted sort, his heart too busy pounding in his chest to be anything more than a little mad.
And Yuri's touch takes away any of Flynn's last reservations. He licks only at the tip, and Flynn wraps his fingers through his long black locks, craving more and trying, trying to get more. Yuri glances up and meets his eyes, and Flynn closes his in response. As the other man takes him in his mouth, Flynn's hips buck unintentionally at the hot touch. Yuri sucks sloppily, no real technique but the bobbing of his head and the licking of his tongue, but there's something in the way his tongue plays over Flynn's cock that threatens to bring him to his knees.
Yuri shifts beneath Flynn, a bit of red skin visible beneath the rope that ties his hands together behind his back. Flynn hears his own words echo in his mind. "You run that mouth of yours too much… Let's see if it's good for anything else. Can you make me come using only your mouth?" "Hah. You have to ask?" He doesn't regret this bet, not at all. He's smart enough to be grateful he has a lover who can reach such places with his tongue. It makes his pride sting but the pleasure easily overtakes any amount of hurt pride.
Yuri pulls back as Flynn's breath quickens and his abdomen tightens. He lets Flynn's cock almost out of his mouth, holding the end with his lips, and Yuri doesn't have time to hold back the groan that escapes him. Flynn knows he's close, and damn him; Yuri definitely does too. The dark haired man sucks in Flynn down to the hilt, and Flynn scrambles to get a better grip in his hair, half pushing him away and half pulling him closer.
One more breath and Flynn comes on the exhale, tugging away for fear of choking the other man. Not that it matters, with someone who seems to have no gag reflex. Yuri gazes up at him placidly, swallowing the white from his mouth and licking it off his lips, and Flynn feels another rush of arousal.
"Well? Want to untie my wrists now?" Yuri asks, smugness clear in his tone.
Flynn wonders if kicking his lover right after fellatio would be frowned upon.