Tremors - like small earthquakes - moved through her body. She pressed her head against my chin and held on. Her body went rigid and her breath hitched. I slid her up, one more time, and when I slid her down again, her clitoris bumped against the crown of my penis. When that happened, she girl-jizzed me.

It wasn't a lot - but it was just enough to make her slippery - and just enough to let me know that she had climaxed. My sister had cum rubbing her vulva against my cock.

I jumped at the sound of knocking on my door. We were mostly covered by the blankets...