There's a flicker of real concern at the noise, Otabek pushing some of Yuri's hair out of the way to search his face for just a moment, but he's satisfied that Yuri's telling the truth about being okay with this and, more importantly at the moment, that he's not hurting, just overwhelmed. It's a fine line, but it's one he's finding he really enjoys walking when it's Yuri.

He can't move very far like this if he wants to keep kissing Yuri, and he does, so the first few thrusts are deeper but small, almost incidental to what his mouth is doing, tongue playing with Yuri's, letting him get re-used to all the sensations without actually stopping anything. The nails in his shoulders get a low moan, more like Yuri was giving him a massage than clawing into him. He's not sure how he would feel about something just hurting to hurt, but the fire from everywhere Yuri's scratched him is amazing and the nails in his shoulder just make him feel that all the more acutely.