Cucks should be primarily having sex with bulls and bulls should feminize the sissy early in the relationship. Since cuck can't fuck wifey like a man, the bull should turn him into his "girl".
The bull fucking the cuck in front of the wife makes it clear that he's the alpha and the cuck is the beta, which solidifies the dynamics of the three-way relationship. In other animals, it's common for alphas and betas to have sex, especially when females are not around or not fertile/receptive. It also prevents feelings of jealously. The cuck gets used to cumming from the bull pounding his prostate, gets conditioned not to expect sex from his wife, and becomes more subservient to the bull.
The bull penetrating the cuck shows him what the wife is getting and how it feels to get alpha cock. He's getting the same sperm inside him as the one's fertilizing his wife's womb.
An idea could be to restrict sex between the cuck and the hotwife (denial) and have sex depend on how far the cuck goes with the bull.
Go from the cuck having sex with the hotwife, to only oral, to only handjobs, to no more sexual attention from the hotwife. And she says if you want to have sex with me (or get a blowjob or whatever) you have to touch his cock (the bull’s)
Gradually raise the stakes, it goes from touching his cock or no sex, to handjob or no sex, to putting his mouth on it, to licking it, to being penetrated.
There was another comment here that reflected the wife's feelings:
"She told me she needed to see them dominate us both and if we were going to do this we should do it together as a couple. If I was going to share her and her fall in love and get what she needed then we should each acknowledge our places in the relationship and show them I accept her feelings for him and show him I accept he him physically and mentally taking my place sexually and I accept my new role in all our lives and relationship by showing them both I submit to him sexually as a better lover and really help create an atmosphere of submission to help increase her desire for him as the alpha male instead of me and for him to feel more energized to fuck her better than I can as her alpha male to give her what she needs by showing them how much I understand and accept his larger cock and give him a dominating desire to cum inside her pussy in front of me and her accept and admit that more after he pegs me and I fluff his cock in front of her and thank him afterward by cleaning them both. She needs alpha dominant bulls to please her and part of that is them dominating over her man who she loves, but needs to see the bond broken visually so she can accept and admit her feelings and needs have changed for me and grown in different directions."
Great post. If you are a cuckold then you are a beta. What do alpha males do to beta males in most other species: fuck them in the ass. There are not gay horses, dogs, etc. Still, the alpha shows his dominance by breeding all females in herd or pack, and makes the beta males take his dick up the butt. Just how things are, and perfectly natural.
My advice is submit to the alpha, listen to what he says, and accept who you are.