My ex girlfriend used to have a thing for her dad, whenever we would stay over she would wear skimpy clothes and make sure he could see her v***** pressing through the tight underwear. I would obviously notice him looking every few seconds and then they both looked away. What’s annoying me is that night I woke up around 2am at her parents house and she wasn’t there. The door was open a tiny bit so I looked out and saw her walking very slowly from her dad’s room (parents slept seperate) shutting the door gently. I climbed back into bed and pretended to be asleep as she went into the bathroom and pretended I didn’t see anything. She’s 24 I’m 29. Some time passed and then a while later we stayed at her parents again and same as last time I woke up to her getting out of the bed as it creaked and she left the room. This time had her phone open on the draws next to the bed with dad’s messages saying r u awake princess and come to my room and even selfies in shower to him. My heart was racing. I listened at the door to her giving him a full on b******* and swallowing it all. I don’t know what to do. They all seem like a normal family mum dad 2 daughters and a son. I think they have s** when they are alone too