My girlfriend and her friend's couple were supposed to go on a trip, but her friend's boyfriend couldn't go because of work on the day, so the three of us stayed in one hotel room. I was worried about my friend's girlfriend, Rin-chan, who seemed lonely, but I got excited about staying with her for the first time in a long time and had sex with her without her noticing! In fact, Rin-chan, who was listening to it with her eyes half-open, seduced me and NTR! I was getting horny too... I even came inside her even though my girlfriend was sleeping right next to me in a row.