Your fantasy reminded me of what I used to do with a boyfriend I once dated We would go out together and he would drive me home. Nearby where I lived was a quiet area surrounded by trees. Nobody could tell we were parked up there.
I would get out and sit in the back seat and he would join me. I let him kiss and finger me and it felt really good. Then I would undo his pants, releasing his already stiff cock. I would suck him and use my grip on him to get him really harder, tasting his precum. I would put a condom on him for obvious reasons and then straddle his thighs facing him, my hands on his shoulders. He would thrust upwards as I gyrated on his cock until we both cum.
We did this for a long time each time we went on a date until he found someone else. We parted and never saw him ever again. But it was fun while it lasted. He was quite a big lad regarding his cock and those thrusts were amazing, hitting the right spot each time
How could ANYONE that had you as a sex partners EVER want someone different?
Was he gay? I can't imagine leaving you.