My step sister's strange fetish: fat and chubby women

I've got a kinky step-sister, let me warn you. Her fetish is as strange as they come - she's into chubby and plump ladies, no exceptions. She's always on the prowl for them, and when she finds one, she's all over them like a horny teen on a mission. This time, she stumbled upon this average-looking chick at the gym. Now, my sis has a thing for fitness girls, but this one was extra chunky. That didn't stop her from approaching the poor girl and striking up a conversation. Before you know it, they were back at our place, and my sister had her eating out her pussy like a starved dog. The chubby chick was surprised at first, but soon she was moaning and writhing in pleasure. After a while, she gave my sister a mind-blowing blowjob, and then they switched places. It was a wild ride, and I couldn't help but watch. My sister's kinky fetish never fails to surprise.