Sherlock could see his body reacting, tensing, he could tell that John was close, and he wanted nothing more right now than to watch John in the throes of passion, seeing him sullying himself with his own seed.

"Yes, John. That's it." Sherlock encouraged him, his voice an octave lower than usual. "Come. Come for me." he had said it before he was even thinking about what he was saying. An embarrassed blush flushed his cheeks, but he didn't regret it. He wanted John to feel like he had just moments before.