All Billy can do is cling on to Frank with as much strength as he's got left. His muscles burn a bit in protest, and every thrust makes him tremble with overstimulation. Part of him loves it though.

The possessive word spoken against his skin would have been enough to make him come by itself, if he had anything left in him. It still gets him to turn his head and kiss Frank hard and rough and messy.

Right now? He's definitely all his and Billy can't think of a reason to feel bad about it.