Billy may not have been entirely prepared, actually. His muscles go taut as Draco starts to sink in, a noise tangling in his throat as the sensations wash over him.

"Fuck--" If this isn't a level of kinky he's never experience before. He draws in a deep breath, makes himself relax as much as he can as Draco pulls him back. Muscles tighten around Draco and consequently draw out another strangled noise from him.

"Draco..."