It had been two months since Yui and Naoya started dating, but they still weren’t used to being a couple. One day while walking together, a man suddenly calls out to Yui. At that moment, Yui freezes. The man is her first sexual partner from before she started dating Naoya. Driven by curiosity about sex, Yui had slept with him once in the past. Now the man threatens to reveal her past to Naoya unless she submits to him again. Yui is forced into a secret sexual relationship behind her boyfriend’s back, starting with deepthroat, paizuri, and raw sex until creampie overload