A secret sex session begins suddenly amidst family time, taking place inside a long skirt. The mother and son's mucous membranes rub against each other through the thin fabric, and lewd, squelching sounds echo around them. "Oh no... If I move too much, my father will find out!" Despite the dangerous situation of being caught by their father, they can't stop the clandestine insertion. The mother and son, hooked on this hidden sex inside the skirt, can no longer return to being ordinary parent and child...