Interracial Forums - Does cuck must to suck cock and take cock

Me and my wife were doing 3somes few years back. One guy was bi. And has a big cock he was a good looking guy. My wife told me she wanted to watch me and him get it on. I'm not guy but I thought we'll if it turns her on ok. And I'll admit his cock did look good and I thought I can do this. Well she was on top riding him and he was sucking her big tits and he motioned for me to come to him . I got up in his face and he started sucking me. She turned her head and I could tell something was wrong. He liked dick more than pussy although he layer a great fuck on her each time we got with him. But she told me latter I don't want to watch you and him. I ask her but you said you wanted to . She said but now I don't.????? I was will to suck him for her to watch so what caused the change. ????