Turn it red maybe?
You find yourself drawn into a cuckold fantasy the moment your eyes land on that waiting, upturned body.
You feel the heat radiating before your hand even makes contact, the anticipation coiling tight in your chest and lower.
You know exactly what that skin looks like after — flushed, marked, trembling with the particular shame that bleeds into pleasure. You want to be the one responsible for that color, that sting, that sharp intake of breath.