The urge to make him painfully hard when we're out in public.
To rub his inner thighs near his crotch while we're sitting next to each other, brush against his nipples by accident, whisper the most disgusting things into his ear, to kiss his pretty neck a second too long. To see him crumble, see his pupils dilate, his pants getting too tight.
To make him a dumb and blushy mess for me until he's not even able to talk, just waiting patiently like a good boy until I finally take him home.