Not only is the lady busty, she's got a big fat ass. I can quite understand why the man was so enthusiastic about putting her in the anus! How to resist the temptation to fuck such a relief fat ass. But undeservedly overlooked gorgeous breasts, I personally would definitely work his dick between them.
The mother let her son do whatever he wanted, thus making his deepest desire come true, let him fuck himself in the ass.