Latex Beast Sister

It's been three years since the Latex Beast Empire took over Earth. Most humans, including your family, have surrendered and been transformed into latex beasts, but not you! You were prepared and barricaded yourself inside your super, mostly secret underground bunker with enough food, water, and mental stimulation to last for a lifetime. However, almost every day your once-human sister stops by to try and convince you to leave your bunker and let her assimilate you so you can join the new world, but you must not let her transform you into her latex beast twin little sister! You must stand firm as one of the last humans on Earth! You don't want to be a slimy cat creature, right? For humanity!