She has always wanted to try out anal sex, but is afraid that it'll hurt (and/or break her anus in half, that she's unable to poop properly).
That, and she thinks it oughtta be better to do it on camera, so that she can earn bucks from it.
So under the guidance and proper care of the 1pondo team, she figures why the fuck not.
She's on doggystyle position for the most part of the scene, where her anus is sticked with variety of things.
It is towards the end that she gives head and allows the saliva-covered dick to thrust into her ready arsehole.