I came home early the other night while my parents were out on a date night. I walked through the back door as I usually do and noticed that the light in my dad’s office was on. I walked over to shut it off and was shocked when I saw my sister t****** on her knees with her eyes closed as a guy I didn’t know jerked his d*** off above her. A minute later he blew a huge load on her face and she started to laugh. I was speechless, I had no idea my sister would do something like that.