Sherlock is an insatiable bottom. Whenever he gets bored and John won't entertain him, Sherlock goes out and picks up strangers (sometimes more than one) for sex (usually in public toilets or parks or the dark corners of dance clubs, etc).
Then he comes home at dawn, dripping with come. John calls him a filthy slut and makes him describe exactly what happened while he fucks his cum-sloppy hole.
--- (obviously this concept requires a lot of EXTREMELY unsafe sex that would be a very bad idea in the real world. but this is fiction, so...?)
Sloppy Seconds
Sherlock is an insatiable bottom. Whenever he gets bored and John won't entertain him, Sherlock goes out and picks up strangers (sometimes more than one) for sex (usually in public toilets or parks or the dark corners of dance clubs, etc).
Then he comes home at dawn, dripping with come. John calls him a filthy slut and makes him describe exactly what happened while he fucks his cum-sloppy hole.
---
(obviously this concept requires a lot of EXTREMELY unsafe sex that would be a very bad idea in the real world. but this is fiction, so...?)