"Good boy." Sherlock shoved the plug in again and wiggled it around, then he pulled it out, all the way this time.

Since John was already nice an open, and well lubed between what he had slathered on the plug and his cum inside his hole, Sherlock pushed right inside. The plug wasn't quite as wide as him, so he stretched John a bit, but not much, as he slid smoothly inside until his bollocks slapped up against John's arse.

"Oh, you are such a good boy, all open and stretched for your master, aren't you? "