My sister, who usually looks down on me for being a virgin, today found some excuse to take it out on me or pick a fight. I casually showed her my unwashed, smelly dick, and she wrinkled her nose in disgust and recoiled, but the embarrassment of showing my penis to my sister made me hard instead. Since she was really reluctant, I tried to put my penis away, but she seemed to be in heat, pushed me down, and straddled me, so we enjoyed various lewd things.
