A friend jerks off a friend's ass for educational purposes

It looks like this friend of the dark-haired chick wants to connect his life with surgery, otherwise why would he be so passionately interested in his girlfriend's ass? Not only does he look at the anus of the charmer, so the dude also puts his fingers there before inserting anal balls into the ass. Well, in the end, he, of course, smacks the doggystyle girl in the ass, but he will still make a good proctologist.