Secret whore. They're rarer, but my favourite dynamic is when the son knows about her whoring around (maybe his bully tells him, or shows him recordings) but the mother doesn't know he knows, and continues to act sweet and innocent around him. That contrast - getting to see how artificial her behaviour around him is - is what really makes it hot for me.
And for me too. I was very impressed with this feeling some time ago. She was recently separated.
I was upstairs, I picked up the phone but the line was busy with my mom talking to a man. I was silent and listened. He was the new owner of the family shop that took my father and mother out of business. She had a flirtatious and submissive tone, totally different from what she had always had at home, we always spoke ill of him. I think I heard a couple of bad words, of a sexual nature, and from what I understand he asked for a meeting the next day.
I was shaking and I thought and thought about it all night, in the end I thought I had imagined everything. But the next day (look what a coincidence) my mom accompanied me and left me all the day with my grandparents because "they hadn't seen me for a while". I then realized that she certainly wanted to be free to prepare herself and host him properly, most likely in our own home.
In the following days I asked her innocent questions about that man, she always replied that she barely remembered him, that he didn't deserve to come near us, bad person, she didn't want to know anything about him and so on, bullshits after bullshits. And I pretended to believe it and to support her. I am honest when I say that I masturbated for this simple concept, which I felt and still think is very subtle but also strong.