One day, my boyfriend's best friend, Tatsuya, came to the house where we live. I might have been drinking more and more...I might have been feeling a little lax. In front of Tatsuya-kun's sleeping... I had sex with my boyfriend as usual. I got even more excited when I thought I might be watching...Even though I knew it was a bad idea, I couldn't stop it anymore. A record of creampieing with her boyfriend's best friend for four days when he was away from home.