I didn't mind.
When I found out my husband was shagging his sister, he started visiting her since she was separated, when I go on my girls night out, I was on my way to meet up when both friends texted me cancelling, so I decided to go and see my sister in law, I knocked on the door I waited a while I saw the curtains twitch and it took a while to answer the door they looked a bit flustered, plus the after smell of sex you get when male and female body fluids have mixed was in the room, I know that smell very well, but I wasn't angry or upset, I was turned on knowing he had just been inside his sisters vagina, I kept seeing images of them fucking, have I got something wrong with me, it turns me on when he is going to see her knowing he going to fuck his sister, Why am I not leaving him.
Sal J