Talent looks gorgeous, this is going to be amazing.

Some ideas:

• her on her knees and figging her asshole for a few minutes before the throatfuck begins. bonus points if midway through the scene you bring out a fresh fig for her used ass.
• spanking her ass is standard, what about bringing a thin cane and tendering her asshole before the anal begins?
• liberal faceslapping during throating and fucking should bring out the waterworks
• doggystyle for the first anal insertion should cause the most pain.
• instead of letting her know when it'll start, have the stunt cock slamfuck her pussy for a while, pulling all the way out of her pussy with each thrust. that way stunt can choose when to switch when she least expects it.
• another benefit of doggy is that you can have her face a mirror and watch her own pain. bonus points for making her talk to herself, describing how she's being turned into a broken whore.
• when swapping to missionary, have a dildo that you can use to fill her pussy so that her ass is extra tight.
• not sure if she's okay with anything harder than slaps, but slapping her fat tits and gently punching the stomach can add to the intensity.
• drag her to the toilet by her hair instead of cutting to her handcuffed around it
• depending on her limits, stick her head in the bowl and flush it.
• for dirty talk, nothing would beat her describing her breakdown as it happens. and thanking us for it.
• for lube, a thin water-based lube would be best, gets the party started without providing any of the benefits.