During the three days his girlfriend was away, he, who had been abstaining from sex for almost a month, indulged in having sex with his girlfriend's classmate. (Aoi Tsukasa, Sayaka Otoshiro, SSIS-001)

My girlfriend lives with a friend, and I often visit her. She promised to come over and have sex after a month of abstinence. However, during this time, her friend confessed his feelings to me and, while my girlfriend was away for three days, started having extramarital sex...