Shiori was suddenly asked by her best friend to have sex with my boyfriend. For example, you want to see your boyfriend having sex with another woman. Since it's a secret from her boyfriend, she unilaterally asks him to push her down, and Shiori, who's getting a little amused, agrees! My boyfriend just came back. When the two of us are alone, I easily succumb to Shiori's temptation... Shiori is having fun while exchanging signals with her best friend who is secretly watching, but who was she really excited about the most?