"Ohhh... fuuuuuck." Sherlock did indeed grab onto John's horns. They were short and stocky, and there was not a lot to hold onto, so he compromised and kept his left hand on John's right horn, and put his dominant right hand in John's hair, which he held on tight.

He knew he wasn't going to last long, but John hadn't said that he was going to let him come while he sucked his cock, so he bit at his lip and tried to will his body to not go off like a rocket.

Which was hard when you had someone like John flicking his slightly forked tongue over the tip of his glans.