My plain sister, who has been single for over five years, finally met someone she likes and started trying to act more like a woman! She eagerly bought a one-piece dress & T-back to show off, but the lines of her chest and ass were emphasized too much, making my erection impossible to calm down! Before I knew it, I lost control and groped my sister's body, forcibly inserting my dick & cumming inside her! From that day on, my sister unleashed her long-forgotten sex drive on me, begging for my dick over and over again!
