Saki, 36 years old, remarried to her estranged husband and had a new son. His son Yuki is a bit of a mazacon, probably because he has been in a father-and-son family for a long time. He brings her home from school. Grabbing her tea, she heads to the front of the room, peeking through the gap and sees him failing to have sex for the first time. Later, Saki, who comforted her depressed son... "Never tell your dad," a mother gently teaches her son a sex exercise. Maternal love of Sakima, which is darker than blood relatives!!