Jill looked very seriously down at us and replied, 'Andy, really; go ahead. I want to watch. Fuck her.' Jenna looked at her sister, smiled, and looked back at me. She started moving again and guided my almost-but-not-quite limp dick back into her cunt. She moved her hips back and forth until I felt the blood rushing back to my cock. Jill watched intently as we resumed our fucking. My little sister bounced up and down on my dick with renewed fervor. Soon we had resumed our previous rythm. Jen began grunting with every in-stroke.

'Yeah, that's right,' Jill breathed. At first, I sort of felt 'on display'; I'd never...