He garbles a be careful with that, man because that's his throat and its already pretty damaged thank you. But he doesn't pull away, or off, or stop. He may have lost a bet here, but he's still in it to win it.

Winning it in this scenario being: getting Max to cum.

After the whole conversation about biting and vampires Pratt probably should have figured out that teeth were a good thing way earlier than this, but his brain is peach tapioca, and it functions even worse when he's horny and all his meager intelligence is in his dick.

Max will get some more lip and tongue action before another, slightly rougher grating of Pratt's lower teeth.