These silly gooses take a short break from fucking and sucking to have a little lulz on set, because even pornstars need to have lulz every now and then.
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.