My sister came to stay at my house, where I live alone, and her room clothes were super thin and defenseless, so I was excited. She also asked me to sleep with her, but as her brother I should never lay hands on her, so I told her, "If we stay alone any longer, we won't be brother and sister, so we can't meet alone." She started to rub her thighs against my penis, thinking that I should just not have sex! But of course, I inserted my penis into her pussy, which was already getting wet! After she forced me to cum inside her three times in a row without pulling out, I lost my reason and kept holding my sister over and over again...