Sherlock Is All Tied Up
It was Sherlock's bright idea to go to a sex club while on the trail of a killer. It's up to John to help them blend in. Luckily, he's got some experience in this arena.
(Part of my "John and Sherlock's Kinky First Times" series of shorts, all revolving around the same basic theme of "John and Sherlock get sexy for the first time and also discover some kinky stuff about each other.")