There's a definitely smugness in Draco's lust-quiet laugh, distracted though he is by the fingers in his hair, and the overall rush to expose even more skin as quickly as possible, with which he is all too happy to assist. He inhales a deep breath, mostly an attempt to steady himself, and delivers a rather slow bite to the curve of Billy's neck before he shifts back enough to help in the pushing down of his own pants, and the attempted dragging down of Billy's.

He manages to get them just past his hips anyway, only really just far enough for him to get a better grip on the full length of Billy's stiffening cock. He whispers a wandless spell, one of his most familiar, and his fingers are slick enough now to stroke, slowly, but quite tightly.

"Is that a request, or just an exclamation?" he drawls a bit, leaning in to trace his lips experimentally along Billy's jaw and nip faintly just at his chin.