First anal sex - with my sister's friend ⇐ Stories about M+F sex

[Anonymous]

I’m 19, I’ve been sexually active since I was 17, I have a girlfriend.
Recently, my older sister and her friend returned home in the morning, drunk, my parents were at the dacha, I was sleeping, I woke up because someone had gotten into my panties, when I opened my eyes and saw my sister’s friend. I asked her what are you doing, I wanted to move it away, but she took my dick in her mouth, I just relaxed, then she sat on top, started jumping and moaning, I didn’t immediately realize that my dick was in the anus, when I realized, I put her in doggy style and I started pounding, she waved me up, pushed herself full length, rubbed her clitoris and moaned loudly. I filled her ass and lay down on the bed, she went to her sister’s room.
This was my first AC, it didn’t work with the girl, she was in pain. But that's not even the point. I’m ashamed in front of the girl, I don’t know if I should tell her everything or if it’s not worth it, it’s just blowjob and anal, we didn’t even kiss. I love a girl, and this all happened somehow spontaneously, I didn’t have time to figure out anything when I was asleep.