The tiny voice in the back of his head is driving him on towards more, more - but he stops himself, refrains from doing anything too suddenly or forcefully until she gives him the go-ahead, whether verbally or otherwise. The push of her hips against his hand, though, is pretty easy to interpret, and while he may not be the most dexterous sometimes, he can still manage his way around buttons and zippers with only one hand to use while the other threads into her hair, tangling in silver strands.