I guess toys, progressive fingering, pegging, and practice have been discussed. But psychology is very important too. The best way to relax prior to the penetration is not to think of yourself as a man; the black guy is the man. You aren't. The first time is all about "breaking the cuck". Your wife can help with that by pegging you in front of the bull and exchanging kisses and caresses with him, so you understand there is one woman and one man in the room. You're accessory. If she cums by the arousal of humping your arse, or by finger stimulation by the bull, that's a plus. After that, it's the black guy's turn. Physically, your boipussy is already well lubed and stretched and depending on his cockhead's shape, a little thrust can bring some 2 inches of black cock inside you. If the emotion is still too much for you, your wife can help by holding you in place and you may watch them again exchanging love. Think: there is a couple in the room having fun. He will start thrusting his thick black shaft further into your boipussy. Pain? Look at your wife. See that stern face? Do you now want to disappoint her? Nope, right? You relax a bit more and soon it will all over. You start to feel fun? Great. Focus on that. Soon you'll notice he starts groaning and you feel his thick cock throbbing. Cum is running down your balls, and it's not yours. You come to the realization it's another man's sperm. Great, right? Well, that's what women feel. Congratulations. Maybe you get to cum as well, as it happened to me. Your wife will first congratulate her bull and kiss him romantically. If she saw your dick getting stiff, your wife will kiss you and tell to you she knew all along you were a faggot. Your inhibitions are all gone. If, however, you start crying, she will come and show to you her motherly instinct, giving you comfort, congratulating you, helping you feel well. One way or the other, you notice he cum inside you, leaving his DNA there. It's the moment of awareness, enjoy it - it's all over. You have been broken. It's a goodbye to that cockiness of yours. That moment is a game changer. Her bull may not do that again, but they will bring you a bi or gay black guy to play with. Your wife will be relieved she now can focus on great sex with black men. And you too. You'll start spotting big cocks in public, brown, white, oriental men. Your ass is now game for them.