As a primarily top in a monogamous relationship with a bottom, the small things that drive me wild are:
1. when sleeping, he moves his ass right against my cock, purposefully wriggling it. It’s a small gesture but it gets my engine revving no matter how tired I am and will either fuck/breed him or jack off into his crack after servicing his body
2. When showering together, he similarly will purposefully bend over to pick up something t like shampoo/facial scrub/soap etc and bump his smooth, hairless ass against my cock which will warrant the exact same reaction as point #1 above
3. when having leisurely time apart in the house, he sticks his ass in the air when laying on his side on the couch, floor, bed etc and reading or on the phone. I can’t help but grab it and engage in activity described in point #1 above
4. When cuddling, he burrows his head against my breasts (I’m trans) and looks up longingly at me. I get immediately hard in both my cock and nipples and he knows that. I’ll usually bury his face with my breasts and stick my cock against him too and rub one off