The room grew quiet as Mike raised the vial and with a flick of his wrist, splashed it down the front of Gemma’s dress.The liquid soaked into the fa...ric of her dress, darkening the colour as it spread. At first, Gemma felt nothing then she became aware that everything felt tighter. The dress seem to cling to her round form now as her wide hips and arse became more prominent. Beneath her panties seem to rise up into the crease of her vagina and bum cheeks whilst her breasts strained in her. Peter was waiting on the dock when we pulled in. He hugged Beth and Gracie, shook hands with Sheila and made me carry his luggage. After we cast off, Beth and Peter went below with Sheila and sent me into the wheelhouse with Gracie."Question." She said looking out over the water."Yeah?" Are you ever gonna tell Mom and Dad you been sleepin' with Beth?" My mouth dropped and I stared at my sister. She turned, looked at me then her mouth dropped. "OhmyGod! You really are sleepin' with Beth! I. Suddenly and involuntary, I shuddered, and a feeling of intense pleasure washed over me."Oh Terry," she gasped as I felt my penis erupting inside her warmth, each spurt seemed to send ripples of pleasure through us both, I sensed her looking at me, and I opened my eyes. We stared into each other's eyes as I spurted for the last time, I kissed her, and we clung to each other as we came down from the plateau where our incestuous coupling had lifted us."I'm not sorry, Terry," I heard her saying. Her TV remote immediately got her thinking about the cocks she'd sucked; the "submit" button on her email log-in made her wonder what it would be like to submit to a big, hulking man; even the act of plugging her iPhone in to charge reminded her how much she wanted to be plugged, how charged up she was feeling.What Molly hadn't noticed was that each orgasm was knocking a few points off her IQ. After her fourteenth orgasm of the day, her to-do list has simply read "Cleen, jim, cum", and by.