John watches her and for a moment he touches himself through his trousers. She's got him hard and aching and he could very easily take her just like this. Ass ready, offered up. He could do it, have her, have it over. But he wants her used up completely by the time he comes inside her so he resists the temptation.

He does pull off his shirt so he can enjoy her skin against his own. Then he crawls onto the bed behind her and begins to nip at her lower back, then he catches her panties just to pull them off her ass and expose her lips. He traces the shape of her with a finger before moving so he can tongue her from behind.