The bulge in Tyler's trunks reached obscene proportions as he watched his naked sister get on her hands and knees on the recliner with her epic booty tilted up toward him. Michelle kept that enticing pose on all fours for a few seconds, then she wiggled her big bouncy asscheeks a little bit and sensuously leaned down, until she was lying on her tummy like the day before. As her brother drank in the plump perfect roundness of her protruding rump, Michelle looked over her shoulder at him and pointed out: "You've gotta be fully naked too, Ty! I mean, it's only fair, right?"

The intoxicating mixture of trepidation, excitement...