Initially she makes it pretty clear that she doesn't want anything in her ass. But our hero Johnny Cock Rocket uses the powers of persuasion and before you know it he's making sweet love to her festering cornhole. Not exactly fap worthy but if you're like me you'll fap anyway.
He tries to get her to say "you luv black cock" but she doesn't comply... so he thrusts even harder which leads to her having orgasmic spasms in a retard-like manner.
Apparently getting your dick hard for a hot pornstar isn't as easy as you'd think. I'd probably blow my load before even getting my cock out of my pants.
I like to believe this has less to do with his cock and more to do with her vagina. Some girls are just extremely sensitive down there, and I think that even a 3 inch pecker such as my own could produce the same results. Don't pity me for having hope.