"You don't have to have sex, just rub...please, big brother" Intercrural intercourse with a younger sister who loves her brother! My younger sister came to stay at my house, where I live alone. It's okay to come over for the night, but when you're in your room, you're wearing very light clothes and you're too vulnerable. I can't get enough of it! Moreover, she wants to sleep with me, so I can barely hold back...