I stood with my head poking round the door. My hand stroking my cock. I looked at the two girls. My girlfriend was slightly taller, slightly slimmer, with bigger tits and a smaller ass. My sister was slightly shorter, slightly chubbier, with smaller tits and a bigger ass. Not short, chubby, with small tits and a big ass you understand, just different to Stacey's. And Stacey, not tall, slim, with big tits and a small ass. Just different to Laura. But both fucking beautiful. What did I prefer? At this moment I stared at both and I felt so hot. It was sensational.

And so I decided to act. I...