I 23F had gone out with some friends into the city. We went out as a group of 8 people and thought the best thing to do is share some rooms together. My bf's best friend, my best friend, my bf and I were all grouped to the same room together. We got a nice hotel room that had separate rooms so my bf and I could share one then there was another bed and a fold out bed for our friends. We all had a good night and had quite a bit to drink. My best friend and I had stayed out longer with some of our other friends while my bf and his friend had gone back to the room just a bit earlier. We started to make our way back to the room when my friend fell fast asleep on the fold out bed, I had walked over to the bed thinking my bf was in it. I gave him a few kisses and put my hand down his pants. I started stroking him and didn't really think anything was different. I had taken my pants off and was just wearing my top when he pulled me in closer and I put his dick inside of me. We fucked as quietly as we could as he cummed in my mouth. I swallowed it all and laid down beside him. After a little bit I stood up got changed into some other clothes and when I looked at the other bed in the room I noticed it was my bf. I panicked and decided to just hop into the same bed as my bf and pretend nothing happened. After we woke up and had started walking back to catch the train my bf's best friend whispered in my ear "I didn't know you thought of my like that".