Brother-in-law fun

When I was 18 and a senior in high school I went to spend spring break with my sister. She was married, was 21 and her husband was 22. He went out with some friends one night and I stayed home with my sister for some girl time. We stayed up late talking. We were sitting on their bed until we both fell asleep. When her husband came home he crawled into bed and fell asleep behind me. I woke up in the middle of the night with his hands up my shirt fondling my breasts. I was still half asleep and it felt good so I pretended to be asleep and let him continue. Then he stuck his hands down my pajama bottoms and started fingering me. I couldn't pretend to be asleep any more and it felt incredible so I reached behind and started giving him a handjob. I continued until he came and then we both went back to sleep. My sister never woke up. We both pretended it never happened and have never talked about it since.