What pushes his buttons in every day settings? You can get a lot of hints from that.
A few suggestions:
- don't call him by name, or any terms of endearment you may normally use. Try everything from "boy" to "scumbag", see what triggers a response. NOTE: avoid any emotional scars. If in doubt, avoid anything personal (e.g. if he is overweight, "fatso" is probably a bad idea.)
- be selfish during sex. You cum, he doesn't. His is not to ouch his cock or pleasure himself, etc.
- make him sit on the floor, eat only after you finish dinner, etc.
- use clothing, or its absence: make him feel exposed. Some things feel more naked than actual nudity.
- call a close friend, and talk about your toy (while he is listening). Get detailed and creative.
- put him away when you don't need him! Toys should be put away after use. Have him sit in the bedroom for 20 minutes waiting for you, while you enjoy a bit of TV before bed.
- If you plan to fuck him, tell him to go clean himself, lube up him ass, and lie face down on the bed with his legs spread until you are ready for him. Make him wait.
- serve him water in a dog bowl. Make him lap it up. Later, cum into the bowl (or piss in it), and tell him that's all he's allowed to drink.
- write on him in marker (places normally hidden by clothing). "Property of: {name}" is an old fave.
Enough for now, I'm getting hard.