The time I fucked (m)y gf until she forgot how to walk

So this happened with my ex-gf while we were both at uni but in a long distance relationship, I was 19 and she was 18. One of my gf's friends had told her about asex position a bit like doggy except her head would be down on the floor and her ass up in the air and my gf said that she was desperate to try it with me.

So when we next saw each other we were all over each other the minute we got back to her uni accomodation. It started off with all the regular antics, making out and missionary on her bed but then she told me she wanted to try the new position. She rolled her yoga mat out on the floor and put her head on the ground and her perky ass up in the air. I positioned myself behind her and slowly entered her already soaking wet pussy, she moaned deeply.

We started fucking, I would vary the pace and length of my strokes. If I felt I was getting close, I'd pull out and just tease her with my tip which alone made her moan and beg for more. When I recovered I'd thrust deep inside her making her scream and moan with pleasure (even though she was trying to be quiet because the walls were paper thin). It was all so intense and made even better by some ass spanking and holding her arms behind her so I had full control of her body.

Eventually after 15-20 minutes of fucking and my gf cumming multiple times, I found my own orgasm building up again and this time it all felt too good to slow down. I increased my pace with deep hard strokes. She was moaning in a pleasure euphoria. I finally felt my orgasm explode and I shot ropes of my cum deep into her pussy. The orgasm was so intense it made me feel faint and light headed. We just stayed there with me inside her for a few minutes until I came to my senses and withdrew.

I went and sat on the bed, but my gf didn't move from her head down ass up position. She just stayed there, her legs were shaking and quivering, she didn't say anything it was like she was still all consumed with the the intensity and pleasure of what had just taken place. Her legs and body continued to shake whilst my cum leaked out of her and I just admired the sight. Finally after 5 to 10 minutes of shaking uncontrollably she gained the composure to crawl over to the bed. The first words out of her mouth were not niceties, no, she simply smiled and said, "You just fucked the shit out of me".