“There are two things you must do before you can shift,” explained Candi. “The first one is wait until you’re eighteen. The second is…” sh... paused, as if afraid of how I would react to whatever it was she was about to tell me. “…you must have sex with a family member.”I didn’t react for a few seconds.“What the fuck?” I finally said. “Are you serious?”My sister nodded. “The shifting gene is already within you, but the only way to activate it is through incest. If you want to shift, we need to. "Oh God, Bobby, yes! Play with my little titties, Bobby! Oh, they love to be played with... to be licked and kissed and sucked... Oh God, please, please suck my little titties!" she moaned as she ground harder on the bulge in my sweatpants. I was as caught up in the sexual fervor as she was and without even thinking, I leaned forward taking one of the hard little buds in my mouth."Oh fuck, Bobby! Yes! Oh God, Bobby, suck my little titties! Nurse on your baby sister's little titties! Oh, fuck. My aunt and uncle called in periodically to check on me but being sixteen and the fact it was only to be a couple days, I was pretty much left to my own devices. In truth it was probably a good thing I’d had the last three days to recover as I could hardly walk after Friday nights and Sunday morning’s love making sessions before he left. Though now as I was mostly recovered and I couldn’t wait for my big, strong Daddy to get home. He’d called earlier to say he would be arriving later today and. She said nothing, looking dejected. Sam lay on his back and Amanda stood astride his head. I stood behind her and pulled on his leash, forcing his head firmly between her legs. His cock was covered in pre-come as it stood erect, pointing at the ceiling. Amanda rode his face, gyrating her hips back and forth on his helpless head and I pulled harder on the leash, jamming his face tightly into the v-shape between her legs. I heard some muffled sounds come forth from Sam, probably because he needed.