I did something terrible to my roommate and I have never told anyone

Okay so I need to get this out because I have been sitting with it and it is driving me insane.

I live in a dorm with my roommate and her boyfriend basically lives here at this point. We have this unspoken agreement that whatever happens in the room stays in the room because there is literally zero privacy and we both just have to deal with it. It works fine usually.

One night all three of us were watching something and they were on her bed doing their thing, she was on top of him, and it went on for basically the whole movie lol. I was in my own bed, sheet over me, "watching the movie" (I was not watching the movie). I was so turned on watching them and I just quietly took care of it myself while pretending to be very interested in whatever was on screen. I noticed she let him finish inside her which for some reason I could not stop thinking about.

We all fell asleep. I woke up early to them going at it again, which at that point I had accepted as part of my morning routine. After he finished in her she got up, got dressed, grabbed her card and said she was going for coffee. Normal morning.

Except then he looked at me.

I had sat up and the sheet had fallen off and he could see I was not wearing anything and he just... asked. Very casually. Like it was a completely normal thing to say. "Do you want to?" And I know, I KNOW, it was wrong, she is my roommate and I actually like her a lot and this was a terrible idea in every way.

Reader, I said yes.

I got into her bed (!!!) and I am aware of how I look, small and pale and goth with my dark smudged eyeliner from the night before and my (big I guess) tits very much out, and the way he looked at them when the sheet dropped told me that had probably been a factor in him asking lol. He got on top of me and I was already embarrassingly wet and he noticed immediately and just pushed inside me without any further conversation and oh my GOD. I had not had sex in so long and his cock felt incredible, way better than I was prepared for considering he had literally just finished twice. He fucked me properly, not a quick awkward thing, actually fucked me, and I had to bite my lip so hard to keep quiet.

Neither of us said a word about where he was going to finish and he just came inside me. A lot. Which surprised me given the morning he had already had lol.

Okay so HERE is where it gets actually insane.

I had literally just got my underwear back on when I heard her key in the door. He was already dressed somehow (???) and just said hi to her on his way out like a completely normal person leaving for class. She came in holding two coffees. She had got me one.

She sat down on her own bed (the bed) and handed me my coffee and we just sat there and talked for like twenty minutes. Normal roommate chat. And the ENTIRE time I was sitting there with her boyfriend's cum soaking through my underwear. I kept thinking about how her underwear was probably in the same situation from earlier. That thought alone was doing things to me that I am not proud of.

When she left she gave me a hug and squeezed my nipple as a joke because she does that sometimes and I nearly lost my mind completely.

I feel genuinely terrible about this. She is a good person and a good roommate and she brought me a coffee.

But also it was one of the hottest mornings of my entire life and I do not know what that says about me (nothing good probably lol)