Yu wouldn't mind if Yosuke came before him or anything like that- doing this all of a sudden and not really having a lot of experience with it from before can be a bit overwhelming. Yu is heavily buzzed by it as well, only Yosuke was going easy on him.

Until he changed his mind and sped up the strokes. It forced Yu's lips to separate from Yosuke's neck in favor of taking breaths and groaning. His whole body is shuddering, but even in the haze of all this pleasure he keeps attention that his hand is constantly moving with firm grip. Next time he'll surprise his boyfriend with a blowjob.