YES! Perfect. So many people make John the Dom and Sherlock the sub in their BDSM stories and when I wrote my BDSM AU in that fandom I had a whole lot of comments asking me why I chose Sherlock as the Dom and how they were surprised and I was like "Dude, seriously? Sherlock is" (in your words) "de Sade to the bone."

Of course, yeah, I can see John being a Dom, but in the series he follows Sherlock's every move. He's just... well, you know. Him being La Petite Mort is beautiful.

Your AU will be perfect, I have no doubt. I'm so excited for it.