She was the proud mother and father of her son, who she had raised on her own, sometimes strictly. One day, when her son came home for the holidays, she invited him on a trip to a hot spring to spend some time with him. As Yuri lay there sleeping, her son started touching her body... "Wa-wait a second..." Yuri tried to resist his advances, but he had grown strong and her body couldn't resist, and she gradually accepted him. She knew it was wrong, but... she couldn't lie to herself anymore. Eventually, she was overcome by the waves of pleasure...