I started sucking several of my ex-wifes regular bulls once they were a couple. I enjoyed showing her and him how much I submitted and showing her how much I accepted how much better and bigger his cock was, that he was her primary lover and that I acknowledged his hung cock and cum pleased her more than I could; I was cool and ok with her telling him in front of me how much better he was than me, and accepting my wife wanted him to cum inside her bareback regardless of my feelings and he could take her without protest in front of me and possibly prepare or pretend to breed her if she or she wanted. I would take care of the baby and accept him as a fixture in our life..Thats how much her regular bulls meant to her and us... For him it was a show of submission as a white cuckold that pleased my wife more than I could and I that I was submitted to him as her bull, lover that he was the dominate lover for her, my acceptance and to show how much I accepted his superior cock and cum satisfied her better than mine and was welcome anytime he or she wanted to breed, mate or take my wifes pussy with his superior cock. It wasn't enough he fucked her right beside me and they both humiliated me and told each other how much they loved or felt...Me sucking her bulls cock regularly was a visual and physical act of submission and acknowledgement to both of them on a primal level that left no doubt to her my acceptance of him and her feelings for him, my role and for him that I accepted his role for her..and by doing it often made them feel comfortable and more at ease, thus encouraging their coupling more frequently and allowing more freedom for them to develop and evolve a relationship together and me to experience it with them. It also helped make my wife feel more comfortable at being dominate over me when he was around and more at ease in allowing me to lick her and him when they were together, face sit and for her to more easily explore and admit her feelings and desires to me about her needs, feelings and actually put me in a place in her mind to allow those feelings to flourish since she didn't have to worry about me being jealous or dominate or interfering, she knew she could feel and allow herself to take the relationship as far as it could without hesitance or worry that it would go too far between them because I showed her and him how much I care, accept, and enjoy participating in their pleasure.... It allowed a lot of role play in various areas and bonds to grow between us all with a regular boyfriend in the mix who enjoyed humiliating me in front of her and encouraging her to participate in order to further gain control over us as a couple and as a further show of his masulinity and my submission thus leading to him mating and taking her more frequently without guilt or doubt.