[both hands are buried in joker's hair now, fingers finding the base of his horns and rubbing there as his hips work in short thrusts, legs starting to shake from the restraint. he begins to fill joker's mouth with precome, panting openly now]

Joker... I... oh, f-fuck.

[it slips out of him like an accident, like a naughty secret suddenly exposed; fox very rarely swears, and certainly not this one]