Hypersexual enhancement

"Well you see, everyone's always got a fantasy about being bigger, increasing the size of their secondary sex characteristics. So I decided why not create a cream that helps out?" Asks the sexy scientist grinning and enjoying your obvious erotic attention.

"Right now every part of my body is elasticised I can literally get stretched to take just about anything, I'd like you to fist me big brother, shove your whole arm into my womb and get me ready for stage II of my experiment.

You swallow hard, you'd never pegged Alice to be a size Queen, but what she was hinting at definitely got the blood pumping just as much as her sultry kiss. You always had a bit of a fetish for girls with a belly bulge so the idea of your entire forearm preparing her for the next phase implies that pheromone perfume isn't the only thing your sexy scientist sister has in store for you.

You can only imagine what you're going to do to her, how massive your member's going to get before you plunge it into her gorgeous body.

You nod in amazement as your sister settles onto the couch and spreads her legs wide using her fingers to show you exactly how much her labial lips can stretch. This is surreal, but you can't help but follow along watching in amazement as her mound swells and swallows your hand coating it in slick juices as you begin to pleasure her like a hand puppet. She blushes and moans, surprisingly cute despite the perverted nature of your experiment, you crawl in until you suddenly meet with tight resistance incredibly flexible resistance. She'd managed to stretch herself deeper, but you just realised that your sister is a virgin. Are you really going to take her innocence like this?