That's a very interesting prompt! But, honestly, I don't think I could write Douglas as a bottom (not because I think it would be out of character, it's just not how my kinks go.) Also, I can really only write sex as a means to some other end, and I think a story that dealt with those "advanced lessons" would need to be smuttier than I can manage.

So feel free to post it on the main prompt post, and if anyone wants to write it in the same 'verse as my story they're free to. Also, possibly RTYI: the "ignoring 'safeword' because it's not the real safeword" thing is something i picked up from etothepii's BDSM au story "Mutual Parasitism", and that scene is...quite unbelievably hot. Not D/M, however, being a Sherlock story.