The door was opened by a tall, very fit, very attractive man in his late twenties; a man I recognised immediately as Darren, a Personal Trainer from t...e Sports Club to which we had all once belonged. He had instructed me on a handful of occasions; certainly often enough to recognise me after only a moment’s hesitation.He was also Julie’s supposedly former live-in lover. He looked surprised to see me; surprised and embarrassed to see anyone in fact.“Hi Penny,” he said awkwardly.“Hi,” I replied,. I didn't like the idea of becomingsomeone else, but what other choice did I have. It was either that, ordeath. And that could very well be death. "We only have one nanite strain" he told me as he took aprepared syringe and set it down. "We mix that with the donor DNA,taken from a blood sample, and inject it. The nanites use that DNA asinstructions for repair yours" "Lets just get this over with" I told him, looking over at Billwho looked pretty nervous. "I want to do this. My sister is getting away with it again. She punchedme and isn't even being punished severally. Like she should," Darian saidharshly to himself.In the next room Danielle stated bleakly, "He just gets away witheverything doesn't he? Just because he is boy and is into all thosesports makes him the favorite in this family. How could dad take his sideover mine?"In frustration, both of the twins said at the same time, "I wish the otherwould understand where I am coming from. They just don't. Just fuck me hard. Sink that hard cock deep in my ass," she said almost hysterically.Those words were more than I could take. I felt my cock begin that last thrust as the cum boiled from my balls and exploded deep in her ass. She also let out a scream as her orgasm tore through her body. I think we both may have passed out. I woke up in a daze and felt my cock finally getting soft. It slipped out of her ass with a plop. We both just lay on the floor for several more minutes before I started.