Girlfriend was called, sister-in-law came to the house suddenly

All the people of the house had gone out, then the boy called his girlfriend at home and called her and started romancing with the girlfriend, but then suddenly the boy's sister-in-law came, the boy was scared to see the sister-in-law, but the sister-in-law said that if he would have sex with her too, then she would not tell anyone in the house, then the boy had both sister-in-law and girlfriend together. Sex done