You can't take it anymore and you feel yourself ejaculating, fluids splashing out of your hole, while a dick rams you from inside.
You moan in pleasure and surprise. You were not expecting that!
However, your man isn't finished yet, so he keeps fucking you while complimenting your fluid hole. He doesn't get that this essentially is because you already cum. He takes your screams of overstimulation as screams of pleassure, seems you must take a second round.