Jamey Dawson Asked: i’ve had anal sex 8 times with my sister and im worried my parents will find out?

i am 17 and she is 13, it started about 2 weeks ago after our parents left to work night shift. i was in my room watching porn on my computer then my sister walked in on me because i forgot to turn the sound down and she heard, i tried to pull my pants up quickly and make something up but she cut me off and said "i want to help" i paused then all of a sudden she took her pants and underwear off. i had never seen a vaginabefore only on the internet, i couldnt resist i took my clothes off and started kissing her. she got on my bed and spread her legs, i didnt want to get her pregnant so i said lets do anal. she got on her hands and knees and i put in in her anus. it was so tight that i had to push quite hard to get it in, she started crying but didnt want me to stopthere was a little bit of blood coming out of her. i came in her. i know she cant get pregnant through anal but im worried that my parents will find out