Seeing that the guy records it on camera - her girlfriend tries even harder. In addition, she wants to look even prettier - she fixes her hair, makes eyes, smiles. Knowing that the guy will show this video to his friends, she wants to impress them as best she can. Female logic!
Too bad there is no backstory, why the neighbor was on the table, why he was so hard to punish her, though it is understandable - without a reason to put in the anus with a full run, few will put in. She deserved it. Or is it a neighborhood game? Like, you poured water all over my apartment, and I'll pour sperm in your asshole. This version I like more, and then everything looks different - not enough he gave her, for such a need much more!
It's an interesting fantasy to paint such a fat ass green! Ladies with such an ass are especially good in the crawl position, a boner is assured. Except you have to have a decent length tool. If you don't have one, I recommend laying the lady on her back and fucking her with your hands on her thighs pressed up against her belly. Otherwise you can't get the dick in deep.
She's a great piece of pussy.