Yuri is not good with surprises. He can deal with them, but it's usually by shouting. Lashing out until he can get the new thing to stop, or control it. If he has space to think it all goes much better.

Like this. He's pushing his hips right back into Otabek's now, goading.

The order gets a grin. Dazed but definitely all for it. Yuri worms a hand between them to unhook the button, zipper, and then he's squirming forward. Leaving Otabek gripping the denim. He can either help or enjoy the show, Yuri's happy either way.