My friend's girlfriend is interested in me, so I had sex with her during our trip. (Akiyama Shoko, MIDE-588)

My best friend, his girlfriend, and I, a close-knit group of three, had a long-awaited drink at home. After my friend fell asleep, his girlfriend, Akiyama Shoko,… kissed me. This made my feelings, which I was trying to maintain without ruining our relationship, begin to waver. On the day my friend went on his company trip, I went out on a date with her, and then…