We first need to stretch your asshole out some. To do so, we are going to need a fat buttplug. Therefore, you need to go and find one right now and yes, you have to keep your lingerie on as you do so. I don't care if someone sees you or not. You're the slut, remember.
While you are searching for a buttplug, go find at least four or five objects that can serve as dildos. We'll be needing them later.