I have a fantasy, but it's not related to bully/mom scenarios. It's an idea developed through femdom fantasy, in which the guy has everything to be the stud every woman dreams of: good face, big dick, athletic body...etc. However, he can't because other reasons come to play.
For example, the stud is painfully shy and freezes when he is approached by a girl. He is romantic and a one-woman man and will never pursue other girls. He has a very religious mother and is afraid of admitting having pre-marital sex to her.