Since John is a very capable soldier and doctor, whereas Sherlock is a big whiny baby, most BDSM fics have top!John using his soldier voice to make Sherlock sorry for being a constant pain in the arse. For it to work the other way requires more effort. John wouldn't submit willingly. He'd require persuasion. Sherlock would have to be very convincing.

TL;DR I'd really like to see dom!Sherlock making soldier!John fall to his knees.