Caught my little sister having sex with a girl?

Anonymous
I was going to visit my parents tomorrow to spend my weekend with them but I got some free time and decided to come here today. My parents weren't home but I have all the keys of the house. I was entering my bedroom when I heard some noises coming from my 12 year old sister's bedroom, I thought she wasn't home either so I decided to investigate. And I sure wasn't ready to see what I saw: my little sister having oral sex with another girl of her age... like wtf. I was literally in shock and didn't know what to do or say, so I just closed the door and went to my bedroom without saying a word. The girl dressed up and got out of here a few minutes later. Now our parents are here and I really don't know what to do. Should I tell them about what the girls were doing? Should I talk to my little sister first? Or just forget what I saw?
Caught my little sister having sex with a girl?
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