The husband went back to his mother's hometown for a few days to visit family, and the wife here couldn't go with him because she had to work. Feeling lonely being by herself, every night the young woman would go to her brother-in-law's room to "talk."
On that evening, coming home in a state of drunkenness, the sister-in-law walked straight into her brother-in-law's room instead of her own. And then that night a lot of emotions happened, there was happiness: when the two chatted about the neighbors around, sadness: when the sister-in-law mentioned that her husband often went to work until the next morning, and... pleasure: at the moment the wife was too drunk to distinguish whether she was with her husband or her brother-in-law, and so... of course both were pleased.