I was caught by my sister-in-law

My sister-in-law saw me giving her brother a blowjob. I was at my boyfriend's house, we were in the living room watching TV, we started kissing, we started getting really excited, so I went to the floor, knelt down and started giving him a blowjob, he leaned against the couch and while I was sucking him he watched the movie, I had been doing this for a few minutes, I realized he was going to cum, when I felt the first drop of sperm in my mouth his sister opened the door and saw the whole scene. Scared, I took his dick out of my mouth, but the jet of sperm came all over my face. I looked at the door and saw my sister-in-law, scared and apologizing. She ran to the bathroom, embarrassed, but all I could think about was cleaning myself, and the only place I could do that was in the bathroom. So I went to the bathroom, knocked on the door and asked her to open it. She opened it and found me face to face with cum all over my face. I smiled and said I needed to clean myself. She quickly left my side and went out of the house. I don't think she'll ever open a door without knocking again.