“Ah, no! If you do that, it will go in!” “We are siblings, so we can’t have sex… We agree to only have dry sex, right?” My sister came to stay with me from her parents’ house, and I was living there alone. When she started having sex with me while wearing my shirt, my shirt got so wet that I inserted it completely and ejaculated inside her! My sister suddenly came to Tokyo, and I spent a few days with her.