My girlfriend's best friend and acquaintance, ``Nishiyama Aika,'' is a celebrity who is active as the popular AV actress ``Kahoku Ayaka.'' I have also masturbated to Ayaka Kawakita's works. One day, when I saw my girlfriend cheating on me and was at a loss, she was approached by Aika-chan, and we suddenly became closer and started having a relationship with her. Having sex with a popular AV actress under the same roof