That green football in her pussy has an extremely negative effect on the appearance of her asshole. It vaguely resembles the Star Trek symbol. I'm afraid that is a salad I simply cannot toss.
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.