Time for the ceremony

All the preparations are ready. It's time for the show. But one last thing first.

"Robert, also, make sure to record all the sex you have with Mads during your honeymoon, and send it to me. Also post it on every porn site you can find under the title "Slutty wife loves being humiliated". It's what every married couple do in traditional weddings", you tell him, not wanting the world to miss out on Madison's complete humiliation. Robert nods as he goes to prepare.

You then go to the bathroom to check on Beverly. You are happy to find her still in her place, covered in cum, and eagerly sucking off one of the guests. Her hair had clearly received some "semen treatment". At last, time for the wedding. You find the majority of the guests are already sitting and waiting for the couple, along with the bridesmaids and groomsmen. While you wait, you take the liberty to edit what the priest will say. You also make it so that the audience fully sees how degrading and humiliating what takes place is, but think Madison deserves it.

Finally they arrive and begin walking down the aisle, cliché wedding music playing. You should change that. In a second, the calm music replaced by some loud song about fucking a girl up the ass. Though they are startles by the change, no one reacts and the procession continues normally. Eventually, they reach the altar. The priest is there waiting for them.

As soon as they arrive to their positions, all the bridesmaids kneel in front of the groomsmen that walked the down the aisle, open their pants and begin to suck their erect dicks. There are gasps in the audience, but Madison and Robert don't mind them, and wait for the priest to being.

"We are gathered here, today, for the mostly sexual union between this man here, Robert, and this ungrateful whore called Madison. But first, the bride's last master, John, will ass ownership of this slut to Robert, by fucking her one last time. Come over here son, we want to move this along", the priest starts, beckoning for you to come to the altar. You hear several laughs when the priest refers to Madison as a whore and a slut.

You quickly head over to Madison, who is standing in front of the altar. You give her a good spank in the ass. She seems annoyed, and looks back at you.

"Look, you ass, I still hate you. This is only a shitty formality", she hisses at you, but are far beyond caring what she says.

"A formality I will enjoy. Hope you enjoy moaning, Mads", you tell her, and before she responds, you hike up her dress and push her panties out of the way. You then push your dick into her tight ass. Simultaneously, you use your powers to give her incredible amounts of pleasure. Madison bends over the altar as you fuck her in the ass hard, thrusting into her as the audience watches with a satisfied smirk on their faces. They too enjoy you degrading Madison. And they are in for a treat.

As you keep fucking her, Madison undergoes several orgasms, each larger and more noticeable that the previous one as her screams of pleasure fill the room.

"Oh fuck! Fuck me harder, John!", she most likely unconsciously blurts out, leading to an explosion of laughter from the audience. You can't guess many girls’ perfect wedding involves getting fucked in the ass against the altar by their ex as the audience laughs. Eventually, your resistance wears down, and you decide to come instead of blocking it. You do need to move things along, the reception needs to be going on by the time Beverly is done, so all the guests see her.

You make one last thrust before filling Madison's ass with your cum. Despite being spent, you use your powers to give her one last orgasm. The best of her life, so all those Robert gives her from humiliating her still feel great, but are never able to surpass it. She will also dream of your dick, and of getting fucked by it, much to her humiliation and chagrin.

After that, you move to the side, and the priest walks up. He gives Madison a quick slap on the ass.

"Now that is done, we may continue", he announced. Robert's erection is quite obvious now. He will get the chance to fuck her once the vows are done.