Mathew Elizabeth's story also presented another kink that I am fond of... the change of the receiver of not only sexual satisfaction from the mom, but also the receiver of motherly love. Corrupting the mother in making her love more the bully than her own actual son, trying to live in a fantasy where she is the mother of the bully and be proud of him, instead of the shame than her actual son gives her.
In other words, the victim wants incest with his mother... but instead, the mother gives into incest in a fantasy with the bully.
What are your thought on this last twist?