There is, but she was cockbloked by my mother.
First time i caught her which was a couple of years before the original post happened. I fell asleep at a house party and we would be sleeping on the settee, I woke up to her asleep in a guy, who lived in the house, arms her trousers open and his hand in the top of her jeans. I moved her to the settee and noticed she was missing panties and lay down asleep beside her. She was dead to the world. Next morning the guy was gonefrom the room and during breakfast she was sheepish. He came down stairs and she was unable to look at him. Asked me if we could go back to her house where she lived with her father. He was traveling for work so we had the house to herself. On the way home I asked if she was ok, she said yes. I asked about her missing panties and she looked shocked and said she wet them drunk and threw them away.
When we got home she wanted to shower but I wanted to have sex, she was reluctant but when I went down on her she fought against it at first then relented and she came hard on my face. I slide up and as I entered her I whispered I know you fucked him, she denied it, but as I was fucking her I said it turned me on, I asked if he had a nice cock and she looked at me and smirked saying yes.
Then denied it for months. We ended up back at that same house for another evening and she was all over the guy and I got annoyed about it and we went home, I didn’t drink and I wouldn’t stay there.
It was months later I found out the truth. But slowly in small bits she would say when we had sex and was drunk enough to answer questions.
It turned out I fell asleep everyone else went to bed and he stayed up with her and put the Telly on, after a few minutes of nothing much on television and small talk he said I have some videos but you might not like them to her. She said she could watch anything so he put a porn on. It was hardcore from what she described and it was a man and a women she sucking him off before getting onto him and sliding down on his cock. my gf asked him if he liked that and he said yes. She said do you wank to this and he said he did. She undid his trousers and took his cock out and sucked him whist I was 3 feet away asleep. I must have stirred because he wanted to stop and she said no and took him to another room sat him in a chair and sucked him more. He started putting his hands in her top and tried to get her breasts. She told me she stood up and stripped naked for him. Then took off his clothes they kissed and he fingered her before she climbed onto his cock and fucked him. When he came in her she wiped her pussy with her panties and handed them to him. Saying now while you wank you can think of this. Then got dressed and came back where I was. They laid down watching the porn and he started kissing her and he oped her trousers and was fingering her when she fell asleep. That’s how I found them asleep.
she also learned that I didn’t mind her fucking others and I got off on it.
That led to different occasions later in life.