Don't rush him, he'll get there!! Nobody watching this would ever know that Val is the sniper of the pair, that's for sure, but the Look is ultimately all it takes. Kazu does shift, reclaiming his hand briefly to move down on the bed and nudge Val's legs apart so he can settle between them.

Having been on the receiving end of things he's expecting a steep learning curve, at least, and he knows what not to do. All the rest, he trusts his partner to guide him through. So without further prompting he leans in, bracing himself with one hand on the mattress and the other at the base of Val's erection to hold him steady, and lowers his mouth.

The realization of 'yes, this is going to be difficult' is pretty immediate, but he's not about to back down from a challenge. He knows enough to mind his teeth and not risk taking too much and choking himself, so that's where he starts, sucking very gently at first to get used to the feel of it.