"There's only one way to find out, isn't there?" that might be smartassed coming from someone else, but Otabek just says it like a fact, "Or you can try me first if you're worried," it's offered easily, even though he knows it's likely Yuri's not going to let the idea that he might be worried go.

He keeps his hand there, though, since it's not a no, finger circling tender skin, the rest of his hand and wrist pressed kind of awkward but firm up against Yuri's balls, cock, letting him feel the subtle motions of his arm muscles up through everything.