Tori's Ride Home

When I was 19, three friends and I were off to a rock concert one evening, so we jumped in the car and off we went. At the end of the evening, we bumped into one of my friends' younger sister, Tori and her pal who had also been at the concert without their parents consent. They begged for a lift home rather than use public transport, so we all squeezed into his car with his sister on my lap in the back. I'd known her as my friend's sister for number of years and always thought she was a little cutie, but no more than that. She sat knees astride mine facing front, and leant on the passenger seat back. This had the effect of her ass resting right on my cock, which I could feel was beginning to get the stirrings of an erection. I lifted her slightly murmuring something about my belt buckle digging into me, and adjusted my cock so it was flat against my stomach. She settled back down and her butt crack was now directly over my cock. She glanced round at me briefly before turning back to talk to her brother who was driving. We had about an hour's journey, and as it was late in the evening the two other passengers in the back had fallen asleep. The movements of the car meant Tori's ass was gently riding up and down my cock which was rock hard by now. I knew Tori was aware of this as she scooted her ass backwards slightly, freed her skirt from beneath her and laid her panty-clad pussy directly over my cock. She slowly began to grind her pussy along my cock, giving me the occasional glance to see my reaction. I couldn't believe my friend's sister was bringing me off! After some time she grabbed my hand out of sight of her brother in front, and laid it on her thigh beneath her skirt. I took this as an invitation and gently edged my fingers towards her pussy. I soon found her damp panties and began slowly rubbing her mound. I could feel the nub of her clit and ran my fingers up and down either side of it, caressing it every so often. By now my friend in the front passenger seat was asleep and it was just the driver, Tori and I listening to the music in the car. I carried on rubbing up and down her clit through her panties as she continued to grind on my cock, without her brother knowing what was happening. I knew I would orgasm soon but it seemed Tori would beat me to it. She suddenly squeezed her knees together trapping my fingers against her clit as she shuddered to orgasm, her panties very wet by now. I could feel the dampness in my shorts not just from my own pre-cum but from Tori soaking through too. I never did get to orgasm then as we had arrived at my house, and I used my jacket to cover myself as I left the car. Tori gave me a peck on the cheek, but repaid the favour some weeks later when we started dating!