Me and my stepsis had messed around with each other but only when our parents weren't at home. I woke up with her naked in bed beside me. I asked her what she was doing and that our parents would go nuts if they caught us. She said she was horny and don't worry she would keep quiet. She was playing with my cock as she rubbed her pussy. I told her that I wanted to fuck her. She said are you sure about that. Without saying anything i slipped my cock inside her and fucked her. At breakfast my dad said that he and my stepmum had heard me and my gf having sex before she left for work. They've no idea that I'd been fucking my stepsis and not my gf. My stepmum said it sounded like she really enjoyed it and my stepsis just sat and giggled
My sister and I would sneak into each others room and masterbate together when we were young. After a few times of masterbation, we began to fuck.....OMG it was amazing 🥰