Atsushi, the son, found out that his mother Kumiko was secretly masturbating in the bathroom. Although he knew it was wrong, he couldn't help but peek. One day, Kumiko asked Atsushi to help her clean the bathroom. While they were cleaning together, Atsushi accidentally splashed water on Kumiko, soaking her clothes. Excited by her erect nipples, Atsushi couldn't hold back any longer and lunged at Kumiko…
