My sister's boyfriend works 200 km away from our town. He doesn't have a car and on weekends my sister sometimes wants to go and visit him. She asks me if I can drive her there. I stay with with them and bring her back the next day. I only do this when my wife is at home all weekend, I can't stand her two days in a row after me. I don't do this for free. We go to the woods when we leave town and she pays me there.