Shizuku Kurikasa lives a newlywed life with her much older husband. Though her days seem happy, she finds herself emotionally and physically unfulfilled due to his weak, easily deflating cock. One day, a single, elegant piece of lingerie appears in her room. Believing it to be a gift from her husband, she puts it on—only to be suddenly discovered by Shinya, her husband's stepson. Shinya reveals the lingerie belongs to him, and despite her fierce resistance, Shizuku is drawn in by his powerfully erect cock, so bold and dominant compared to her husband's. Under its spell, she rediscovers the pleasure she'd nearly forgotten as a woman. From that day on, a twisted love triangle forms, and a new, taboo sex life begins. This is the story of Shizuku Kurikasa awakening to a new world of pleasure.