when your parents turn up unannounced

I live alone so sometimes I like to have "me" time which consists of putting some comfy clothes on and relaxing in bed and masturbating while watching an adult film. Tonight my parents decided to turn up unannounced at my home. Luckily I had dead locked the door so when I didn't answer the door first of all they didn't just let themselves in. I had finished but I felt really weird and uncomfortable when I let them in. I know they wouldn't know what I was doing but still I felt weird