My son, who is about to get a job, is about to leave the house. Yui was happy that her son, who was raised by one woman, grew up well, but felt lonely. My child, who has been hand-salted, goes out of reach ... On the last night we spend together, Yui can't control her emotions and sneaks into her son's futon. My son had the same feelings. Two people drowning in forbidden affairs beyond the unforgivable line. However, her son's sex was far more intense than Yui expected, and it was unequaled. Yui falls into a frenzy world with a continuous piston that does not end no matter how many times it gets caught.