Lesbian schoolgirls degrade mature housemother

A mature prudish housemistress discovers to her horror that the schoolgirls under her charge are operating a phone sex business. Disgusted by this behavior, she expels them all from the house. But the girls take revenge and tie the old woman up and begin to teach her how to eat pussy. The housemother quickly develops a taste for the sweet young cunt and the girls initiate her into their group with a six-way intergenerational lesbian orgy.