I knew I had crossed a line. There was no way I could pretend I was sleeping. I expected Diana to put a stop to this insanity, but she didn't. I curled a finger up her cunt and felt the searing heat of her pussy envelop it. I added a second finger and began pumping them in and out. I thought I detected a faint moan coming from my sister's throat.

I had gone this far and Diana still hadn't acknowledged what I was doing or attempted to stop me. If she was still sleeping, it was a hell of a dream. I had read somewhere that people could have...