Wife Yui is exhausted from her busy husband's unsatisfying sex life. After sending him off to work again today, she instinctively begins touching her pussy. Shy by nature and hesitant to ask for intimacy, tonight her desire runs especially high—her fingers slide between her lips, producing lewd wet sounds as she nears climax. Suddenly, her stepfather appears in the room, catching her in the most embarrassing act of self-pleasure. Speechless, Yui lowers her head in shame, but the stepfather, as if he anticipated this moment, skillfully corners her and overwhelms her with deep, passionate kisses. Torn between guilt toward her husband and overwhelming pleasure rising from her womb, Yui finds herself forced to take her stepfather's huge cock into her mouth. Reflexively, her tongue begins moving, savoring every inch of his thick shaft. In that instant, Yui's mind and body are lost forever.