Of course you need a special kind of model
you cant do that without proper "training" before
Angelina loves a fist up her ass and has absolutly no pain doing it
You cant force a model to do that - either she loves it
and is experienced when it comes to extreme anal play or she cant do it
This cant be reached from one week to another
Many sites claim to offer fisting and anal fisting but most times
its only 4 fingers (mostly from another woman - which is as thick as an
average cock

) but fisting deeper than to the wrist is not so common
Let me know if you need more info or you can also write direct to Angelina
angelina(at)latexangel(dot)com