I was playing games at home with my friend and his girlfriend. She was a cute and kind girl, and I was jealous of a pair of best friends who seemed to get along well. However, after observing her for a while, my friend treated her quite roughly. Phew... what a sinner. Furthermore, he left her and went to work at his part-time job. It was decided that the two of them would be alone and get advice from her about their love problems. I answered innocuous things so as not to damage the relationship between the two, but I couldn't help but worry more about the panties I was glancing at than the content of the advice...! I had an erection from the panties' shots, so I immediately fucked my friend's girlfriend and cuckolded her!