Yuusuke becomes obsessed with his mother Mikuru's big tits, struggling endlessly with how to touch them. Between her household chores, the sight of her large breasts swaying drives him closer to losing control. Unable to resist any longer, he devises a plan. Using a surprise gift as an excuse, he makes her close her eyes, then seizes the moment to restrain her. Taking a bold step forward, he finally reaches out to grope her massive breasts.