Mom caught Us!!

My boyfriend and I have been dating 6 months and I went over to his house to play VR and eat dinner with his family. It was just his mom and sister, and this was the first time I had eaten with them. While my BF and I played VR, he fingered me and then I began to blow him. His mom walked in with my mouth on his dick. HAS THIS HAPPENED TO ANYONE ELSE?? How do I prove to his mom I am not some slut??