In a two-year relationship and I was Christmas shopping with her 11-year-old daughter. We came home early and caught her mother (my girlfriend) fellating a mutual friend. She took him out of her mouth and while still holding it said, “This isn’t what it looks like.” I told her I was taking her daughter to her mother’s house and left.
Aftermath: Never spoke again. Her mother was horrified, as I had done CPR on her dad and saved his life a few weeks earlier. The child was mortified and still calls me 5 years later.