My perverted little sister knows I'm watching and shows me her panties on purpose. I was excited when I saw my sister's panties in the library, so I went to her room to look for her panties, but she came home. "I won't tell mom, so please massage my legs," she said, and her panties were completely visible again. My hand reached between my sister's legs and touched her slit. We were both excited, but we almost got caught by mom, so we stopped. As soon as mom left, my sister and I had sex, and I inserted my erect penis deep into her throat many times in the living room. My sister was excited and urinated many times, even though she said, "No, we're brother and sister." After all, it was my sister who invited me!