Vintage porno with family undertones makes me laugh. It also heightens my urge to be transported back to the 70's so that I can fuck the shit out of hippies along side mothers with beehive hairdos.
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.
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.