A great sex education featuring a mother and her stepson

As they caress one other, a shy guy watches a movie with his gorgeous girlfriend. The girlfriend spreads her hands over her boyfriend's thighs gently and effortlessly. The man becomes hugely jittery. Her bitch takes her top off gently, but the man refuses. She inquires as to why he opposes her doing so. His stepmother ultimately comes to the rescue of the terrified child.