Ok gosh it's been ages since I've read your stories. Okay I think I got it. Since your name is trashmouse and it's the Holidays people of course must wrap gifts for their loved ones and of course with wrapping gifts there are a bundle of discarded ribbons and wrapping papers. So with Trashmouse her friends used her to hold all of their discarded wrapping papers and ribbons by tying her up and gag her mouth with ribbons and wrapping her body in wrapping paper until she becomes like a Christmas mummy made out of the unused discared ribbons and paper. What you think?

Someone turning into Krampus to punish a mouse that's been very naughty.

TrashMouse gets to entertain the eight reindeer while santa is delivering presents. The reindeer take advantage of the santa time magic to extend this sexy interlude for hours and hours while time is on hold away from the sleigh. That's how santa is able to visit all those homes around the world in just one day after all.

A mouse exploring a new gift service, where you can send personalized naughty gifts to others. One of which is a replica sex doll of yourself. Of course, what isn't advertised is the pack they send you for "fitting" purposes actually turns you into the doll. It's got a sensor to let the company know when you've transformed, so a courier can come and package you up in a big box with a plastic window pane. Of course, since you were trying to get Christmas shopping done early, you ordered the pack a month ahead, and thus end up sitting patiently and eagerly in front of the tree, waiting to be opened up and used.

A young anthro woman decides to test her cooking, to see if the cookies she made for Santa came out well; the cookie rapidly causes her to age and gain a few hundred pounds (and inexplicably change her clothes in to red velvet with white trim). While she panics and wonders what's happening, Santa (maybe as a polar bear) shows up and mistakes her for Mrs. Claus. The girl, still processing everything, learns later from one of Santa's assistants that every few centuries, a random woman is chosen to be the new Mrs. Claus and help spread joy to the world (testing out foods that are sent to less fortunate families, overseeing the creation of toys, that sort of thing; to compensate, the women are given magically extended lifespans and assistance in adjusting to their role). The girl was always a jolly sort before eating the cookie and decides maybe the changes aren't so bad.

Maybe the girl can be a short, skinny mouse or rabbit (someone small becoming so massive being a "prey" animal...would that be irony?)