Watching Porn With My Girl Best Friend

When I was 13, my girl best friend Sarah and I were hanging out doing whatever and we stumbled across some porn on the internet. We both got super horny while watching some girl with a fat ass get railed by some bbc. She was slowly starting to rub one out through her pants. My dick sprang out of my shorts and was rock hard. Both of us just started jerking it together. It's a habit we maintained for a long time. We never told anyone and nobody found out. When I turned 16 we ended up just fucking each other. We would fuck every now and then even after we started dating other people. Even today we're closer than ever and she's like a sister to me, except that I fuck her and masturbate with her.