In the MILF thread you said you have upped the frequency of you and your young lover fucking to six times per week, so it seems you are well taken care of
The bully seems like the perfect lover for you. But to manage almost one fuck per day, you must be quite creative in order to not get caught. Are you a stay at home mom, so you have the house to yourself most of the day?
A number of members here have suggested that you become involved more directly in bullying your son. Exciting possibilities, for sure, but maybe hard to accomplish in practice. I imagine you do have to tell your wimpy son off from time to time, and maybe it would feel good to add some humiliation as you give him hell
I bet the sissy whines and complains a lot about being bullied, and I think he deserves to be told off about tackling his own problems.
Talking with your son on the phone while his bully is fucking you is really sexy. Have you done that more than once? Did he sound like he suspected something?