You loved being a pair of panties, but you're done with it. For now at least. Today you think you're going to try something else. When you were Kristen's panties you had a few moments where you could clearly see her looming over you as a giantess, and you think that's something worth repeating. But how to do it?
After thinking about it for a few minutes, you come up with two basic ideas. Instead of being her panties, you could spend today as a shrunken man hiding out inside Kristen's panties. It'll be tough to avoid having Kristen notice you, but you're sure you could come up with something, and this will be just like yesterday, except it'll be much more of a human experience.
Your second idea is much more creative and might even be as fulfilling. You have no idea whether Kristen is into tiny men, but you're pretty sure she's not: most women aren't into fetishes to begin with, especially not ones that, until a couple days ago, you assumed were physically impossible. But that's what the mind control is for. There's nothing stopping you from using the gun on Kristen, fluttering into her ear, and telling her exactly what turns her on the most. And that can be you, half an inch tall.