My sister is my personal sex friend who comes in seconds when I call her. But she's still family. No matter how cute she is, it's hard to do it while looking at her face... So I do it from behind so I don't see her face, and even put a porn magazine on her back in a doggy style position, filling her field of vision with the porn magazine, making efficient use of her pussy. But my sister was dissatisfied with being treated only from behind, and finally she got back at me! She attacked my crotch, which left me confused, and shook her hips hard in a cowgirl position! This time I was her sex friend.