At the beginning of the year I went on vacation to the beach with some friends of my boyfriend (in total there were 8 of us, 3 girls, including me, and 5 boys, including my boyfriend). Since we were going to be there for 2 weeks, we rented an Airbnb.

Since there were many of us, it was normal that not all of us went everywhere together and so, in my case, many times I went out with just a friend or my boyfriend, and the rest either stayed at home doing things or went somewhere else.

On the third day when I arrived in the afternoon/evening, I went to the area where we were all throwing our dirty clothes to wash when the washing machine was not occupied by someone else, so there was a bathing suit of mine among other clothes that were already there thrown away

When I grabbed my clothes to wash them, so I wouldn't have to do it on the last day, as I knew many would do. I found one of my underwear that I wore on the first day full of semen. I didn't even know what to think (I knew it couldn't have been my boyfriend, because we fucked a lot and he was dry), it was very full and it looked like it would have been less than an hour ago because it wasn't dry.

Since I didn't want to create tension in the middle of the trip, I only told it to my boyfriend (who found it really hot), I was left wondering which one it could have been. Because everyone was nice to me, so I didn't suspect anyone either.

I only think about how morbid he was when he masturbated with my underwear, because I can assume that I turned him on a lot as to do that.