'Make sure everything is nice and clean for me', she said. I relaxed as the hot water eased the tension from my body. Lathering myself up, I did as sh...e requested, washing every inch of my body. I closed his eyes and began to rinse the soap off my body, using the handheld shower head to rinse myself clean. Just as I returned the shower head to its holder, the shower curtain was violently ripped open. Before me stood my wife, clad in only a t-shirt and jeans, holding a very sharp knife. 'Get out. Dexter felt himself growing hard in his midsection as he stared at his sister. “Dede, what happened?” But Dexter didn’t need telling, already his scientific mind was formulating a theory. She had taken some of his untested beauty formula. Obviously it worked, obviously too well. “I tried some of that soda. It tasted yucky, but I think I like what it does.” She giggled in a seductive way and looked down at his trousers. “Ooohh. Dexter, what’s that?” Before he could answer, she grabbed his. It had started as a fairly tame picture of Amber in a bikini. He’d altered everything except for her face - his sister’s bust-size had been significantly increased, the bikini had been digitally removed, and Rob had given her almost a dozen more tattoos. Above her ass was a pair of bike handlebar’s, inviting anyone who saw her appealing rear to go for a ride. Above that was a bold-type tattoo reading “Daddy’s Girl”, and below was a series of checkboxes with accompanying text: “is a slut”,. I was speechless and needless to say I came all over the place, panting and out of breath. Cassie's legs were shaking and her whole body began to squirm and shake. Cassie immediately yelled, "Oh my goshhhh I've never done that," which is true, "this is so embarrasing!"Bryan laughed. He sat down on the bed next to her, picked her up and sat him down on top of him. He was still fully erect and now I got to see that perfect cowgirl cock-riding position with her ass facing me just about ten feet.