[Now that's what he wanted to hear. He grins even as he quickens his rhythm again, then takes the opportunity to bite her shoulder. He's not as fixated on biting as some people, but her favorable response to the hair-pulling and the way she's enjoyed some nibbling and biting in the past, well, it makes him think that maybe he can be a little more aggressive. Still, he doesn't make it too hard -- it's an attempt to see what she enjoys, after all, not a way to hurt her.]