My wife's dominant bull is an old friend of mine. We were close friends long before he became my wife's bull as well. He lives near to us, less than 10 mins on foot, and he is free to come to our home whenever he likes to have sex with my wife. She is always available to him. She never says "no" to him no matter how tired she might be, no matter how late it might be.
Being in the cuckold lifestyle for almost ten years we got used to it and we love it very much, so it is a "normal" situation for us. I don't consider it as humiliation anymore even if he invites some friend to fuck my wife along with him. I consider it as a happy situation, as a pleasant meeting for my beloved wife.