I must have been about 12 when my parents were going out for the night and wouldn't be back until very late. They wanted to get me a baby sitter but my friend's mother said I could stay overnight at their place instead. It was getting time for bed and his mother said it was bath time. I had been over at his house many times and witnessed him and his younger sister, who was 9, have a bath together. I would actually be in the bathroom with them and saw both of them naked may times. This time she expected me to bath as well. I told her I wasn't dirty and truthfully didn't really want to be seen naked by his mom and sister. She won the battle and there I was in the tub naked with my friend. His sister came in and talked to us as we bathed. I felt awkward to be nude in her presence but I guess I had seen her many times and this was her turn to see me.