The film has 3 parts with different beautiful actresses but the same content. The story is about a husband who just came home from outside, saw his sister-in-law busying around, only showing her round, firm butt, thinking it was his wife, so he grabbed his dick and rushed in from behind to take a shot to relieve the pain, the sister-in-law was surprised and could only moan with pleasure. After fucking for a while, the perverted husband realized that it was his sister-in-law, but it was too late so he decided to fuck her to the end, as for the sister-in-law, it had been a long time since she had fucked anyone so she was willing to continue this secret love affair.