It might help if you make things more exotic, not just being a bit bossy in bed. Step outside the familiar routine.
Set a time and plan in advance. He is at home alone, watching a movie. He's just had a bath and is in a robe. You arrive unannounced, dressed all in black, with boots and a black ski mask. You pull out a screwdriver you used to 'break in' and tell him to do as he's told. Strip. You tie his hands behind his back. You make him lick your boots. Etc. Etc....
Keep the mask on and STAY IN ROLE until the game is done. Don't use his name because you don't know it. You are strangers.
That scenario is just an example, the details are not the crucial part, staying in role to make it feel authentic is.