He honestly wasn't sure this would actually do it for Spike, so it's incredibly gratifying to find that it does, to feel Spike following him into release. He presses down happily at Spike's urging, giving him as much pressure as he can to help him over the edge, and shuddering again as little aftershocks go through him in empathy as he feels Spike come. The skin of his throat's still held between Spike's teeth and so he doesn't go anywhere, even if he could with his whole body limp with the release of so much intense anticipation. He just lets himself go loose on top of Spike, covering him in hot human, his crazily beating heart gradually starting to slow as he comes down from the high.