As a bull, I personally feel cuckold should avoid cumming till hotwife and bull are not done with their session. Cuckold can be incredibly horny and excited as long as he can hold back orgasm. This excitement keeps him hooked to the action between hotwife and bull and cuckold derives maximum pleasure from that. Cuckold needs to train himself to hold back his orgasm till bull and hotwife reach their orgasm. If cuckold is unable to hold back, he may lock himself in chastity and watch the action. Many cucks lose interest post cumming in the cuckolding action of hotwife and bull and they start to freak out. This pisses off both bull and hotwife which ultimately ruins the cuckold session.
Therefore, I think cuckold must show willingness not to cum until hotwife and bull are done with if he wants everyone involved to enjoy and derive pleasure from the action
