by sprmbnk
I like your description of how you fucked her:
"..I slammed all seven inches of my shaft into her. I would slowly pull my dick out of her pussy until just the head was still in, then I would slam back into her. I do not know how long we kept fucking like this all I know is that once Karen began digging her nails into my back I felt my balls tighten. I was ready to explode inside of her. With one last thrust, I went balls deep inside of her and I filled her with my sperm..."
With your thrusts like that, you showed her who was in control & who she should be subservient to.
I bet it felt extra nice to fill her unprotected pussy with your sperm, conquering cum
So out of the blue, with no character development, this guy's crush takes him to a secluded area and spreads her legs.
Good storytelling takes more than that.