My friend and her boyfriend lived in an apartment complex with a pool and invited me over to hang out and go in the pool. I always found her boyfriend so Hott. In the pool area was a private shower room and after we got done in the pool my friend and her boyfriend went to shower off and have fun lol. I was lonely so I figured I’d go in there (in hopes they would let me join in). So I went into the shower room and immediately hear them going at it. I pretended not to hear anything and just went about my business taking my bikini off. I walked over to where they were and continued to shower. This immediately weirded out my friend and she was like oh hey and left the shower. Her boyfriend was still there with this thick throbbing cock and just staring at my body. I asked him “do you want it”. And he just walked over to me and pushed me against the shower wall and started fucking me. I LOVED it, he felt so good inside me. All of a sudden I hear my friend say “omg I cannot believe this” and she ran back up their room. I couldn’t even stop at that point it felt so good he kept going until he came inside me. We went back upstairs and tried to convince my friend it wasn’t what it looked like but she saw everything. I haven’t talked to her since.