The second thing, and it took surprisingly long for this to reach my brain, as I looked down towards my cock, was that the arm across my stomach and the hand wrapped around my shaft were.....white.

MY SISTER!!!!!!!!!

Fuck!!!!!

Fuck!!!!!!

I was almost too shocked to react. To turn around.

My sister!! Fuck!!

Fuck!!

For the last two nights we had touched each others naked bodies. I had sucked her tits, slid my finger into her cunt and made her cum. She had jacked me off. Two nights. Once could be an accident, a misunderstanding, a mistake. But twice? No way.

Unless......unless.....the first night it had been her friend, and...