I saw my girlfriends younger sister naked, What should I do?

Anonymous
So I was at my girlfriends house (she's 16 i'm 17) and we wanted to play a board game so we everyone in her family if they wanted to play except her sister. My girlfired had to go to the bathroom so she sent me to go ask her sister so I went up to the door and knocked twice and after about a minute I opened the door and her 13 year old sister was on the bed naked pleasuring herself while looking on her phone. She saw me and I was just staring at her akwardly and as soon as I regathered myself I walked out of the room and closed the door. She wanted to play games so it was really awkward with the two of us that whole night. I haven't told my girlfriend or talked about it with her little sister either what should I do?
I saw my girlfriends younger sister naked, What should I do?
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