Secretly watching my sister's booty bounce in a dress

I've always been a fan of the fairer sex, and I have two sisters who are both stunning in their own right. One of them, the brunette beauty, loves to show off her curves in her tight dresses. It's a thrill to catch her walking around the house, her booty bouncing with every step, her dress hugging her luscious curves. Recently, I found myself alone in the house and decided to sneak a peek at my sister's enticing derriere. I crept upstairs to her room, hoping to catch a glimpse of her as she moved about. And there she was, her dress clinging to her round, bouncing booty, a sight that left me breathless. I couldn't resist the urge to watch her, to admire her perfect form. Her big, bouncing booty was a sight to behold, a tantalizing display of feminine allure. I found myself getting aroused by the sight, my crossdressing desires fueled by the sight of her big, beautiful booty.