Girlfriend, soon to be wife, will get bred by another man. [Real story].

I am a voyeur enthusiast. This has comes with some cons, since I don't enjoy much of sexual interaction myself, but now and then, me and the gf have sex. We've had tbreesomes, and I've watched her with other guys and girls. Which lead me to develop a cuckold kink. We're fluid. But as we were thinking about starting a family soon, we got the idea of bringing our fantasy to another level and let her be bred my another man. A responsible, older man, who has its life together and plenty of health. We were thinking of a man who already is a father. We will take all the responsability and will sign an agreement with the breeder. He will be able to keep his life normally, but I stil want to maintain contact with him. Call me crazy, but I'm willing to let it be. I am open to suggestions and thoughts, but would appreciate less of your judgments.