Saori Konishi has not had intimacy with her husband for a long time. One morning, her son Hiroshi won't come out of the bathroom. While her husband claims he's unable to urinate due to "morning wood," for Saori, the situation is completely reversed—she finds her eyes drawn to her son's erect penis standing firm from morning arousal. Facing the embarrassed Hiroshi, she sees his pajamas tightly straining over his hard-on, making her heart race. Deeply intrigued by her son's morning condition, she feels excitement over the changes in his body. Experiencing a new kind of stimulation from this unfamiliar side of her son, Saori finds herself at the intersection of family bonds and rising passion.