Mother and son have sex in 2 seconds after father goes out

"Ah, why did this happen!" Chisato was in a physical relationship in hiding from her son Shinichi and her husband. "A relationship like this will make no one happy," Chisato's guilt grows more and more day by day, and she decides to stop the relationship. However, Shinichi didn't listen and sought even more vigorously as his sexual desire sought. "This is really the last time," Chisato tells herself and as she goes out, she accepts her young, intense lust without a second thought...