One morning, Yukari, a mother, sees off her son Yutaka with a worried look on her face as he heads off to school, clutching his groin. Yukari has a feeling that she knows what he looks like, so the next morning she heads to her son's room, and just as she expected, her son is suffering in his sleep due to his excessively enlarged morning wood... "The same thing happened to my dad, so I didn't think it would happen to me, but I never thought his morning wood would be this bad..." Unable to bear the sight any longer, Yukari gently strokes her son's morning wood as she does for her husband, licks his head, sucks his balls, and calms his erection without him noticing. However, her son is pretending to be asleep, and is captivated by the pleasure, so the next day he attacks Yukari, hoping to get his morning wood calmed...