Yes, I know. Pen just posted, but chat is a bunch of filthy enablers! ♥
So, first of all, let me explain what a bachelor/bachelorette auction is! For charity or as a fundraiser, you take some bachelors/bachelorettes and, essentially, auction them off to the highest bidder. The highest bidder "gets" that person for a day to a week, and they get that person for that period of time. Sometimes you bid for romance, or sometimes just to have a nice date to go to a social event with. The bachelor comes on the stage, and the auctioneer tells the crowd their age, hobbies, and profession! Then the bidding begins.
NOW LET'S APPLY THIS TO THE PLANE
So, you volunteer your characters, and through the magic of AIM dice or some other kind of randomizing, a number (let's say seven just because) of characters are chosen. Whether they like it or not, they're up on the auction block by the Twins! However, the Twins won't take cash. Instead, it's the kinds of things that you have to pay for a wish. Whether it's a precious item or a power, the "highest" bid (or whatever the Twins want most) gets the person person of choice for anywhere from 24 hours to a whole week. The auctioned, however, is bound to follow any request by their purchaser.
Of course, there are a few exceptions to get around that. For one, you can bend the meaning of the words to mean something a bit better. Like if the bidder asked their bachelor to "Get some water", meaning that they wanted it to drink for themselves, the auctioned off could get the water and promptly throw it on the bidder. So as long as they aren't specific, then you're quite alright.
Also, there would need to be some rules, of course. Such as you can't make them kill someone, sexual things have to be consensual (by both parties), things like that. This is for the lulz, not so much super serious.
AND YEAH THAT'S IT :|b