They aren't in a relationship and while John is vaguely familiar with the concept of D/s it isn't anything he ever thought about trying. He doesn't understand Sherlocks's present until Sherlock kneels down in front of him, offering his neck expectantly. John hasn't let himself think about taking things with Sherlock any further than friendship and is seriously freaking out when he finally gets what Sherlock is offering.
D/s sub!Sherlock
They aren't in a relationship and while John is vaguely familiar with the concept of D/s it isn't anything he ever thought about trying. He doesn't understand Sherlocks's present until Sherlock kneels down in front of him, offering his neck expectantly. John hasn't let himself think about taking things with Sherlock any further than friendship and is seriously freaking out when he finally gets what Sherlock is offering.