I have this fantasy about my mother-in-law somehow obtaining control over me and ultimately having me castrated; mainly because I keep getting hard around her and leaving wet spots from pre-cum. Nothing sexual on her part. Then, my wife will periodically see me at her mother's and will be amused by my new status and urge her mother to train me subserviently 'now that he's not a man'.

The thing is that she is very nice and we get along very well in real life. I've started having dreams with her in them and I'm afraid I'll say something one day and she figure out that I think of her in a dominant role. She's somewhat attractive but older than my tastes, but she does reind me of my wife; only my wife is much more dominant in nature.