Alpha Booker’s ruts gets worse and worse, he starts to openly challenge Joe and drops hints he’d be a much better alpha to Nicky than Joe is.
Joe fights him, then fucks him, reestablishing him dominance.

Would love to see, as Booker starts to submit to Joe, their dynamic shifting from an aggression and violence fuelled fight, to Joe (and Nicky) reassuring Booker that once he submits he’ll feel much better, he’ll stop feeling the need to challenge and fight Joe all the time and basically be happier.