Then just as you are ready to burst, you shout "Oh, yes, I'm cumming!"
But Sydney responds by pushing you off of her, stopping your orgasm after you thought for sure you were past the point of no return.
Of course seeing how close she got you turns her on, and she continues to feel herself.
You try to recover your composure on the floor, where you have landed. A small bit of cum dribbles out weakly as your cock flops helplessly in the air.
No, please don't push me off, you beg her.