I saw my 5 year old sister masturbating and In embarassed she will keep seeing me masturbating to

I was in my locker room of my house went I saw her I don't know how she got in cus I locked the door and I don't know how long she was there but for the first second I was surprised then my erection hit my belly I was listening to porn on my headphones and masturbate I was so embarassed for her to see me In embarassed when she will see me masturbating to