IENF-455 - I wanted to lose my virginity to my first girlfriend, but I ended up losing it to my little sister instead...

My little sister, consumed by jealousy after finding out I got my first girlfriend, goes off the deep end. She starts sending messages to my girl claiming I'm cheating, and acts completely unhinged. When I pass out drunk, she takes matters into her own hands, straddling me and riding me until I lose my virginity. It's so intense and feels so damn good that I can't even stop her.