Damon couldn't help giggling at Dorian's pickup line - he'd used many in his own life, but it seemed silly to waste pretty words on a prostitute.
For his part, he was nibbling on the girl's wrist with his teeth, lightly, not using his fangs. When she moved to nibble at his neck, he met Dorian's eyes, sinking his fangs into a vein in the girl's wrist, earning a loud coo of pleasure. He was glad she was one of those girls, one of the ones that would let him drain her dry and writhe in contentment the whole way.