You stare down at Kristen. "You're nothing now," you say. "In fact, I'm going to take over your life and keep you as a toy." With that, you enlarge yourself back to normal size. You take a minute to find Kristen on the floor, and then you bring her up to an inch tall, the better to keep track of her. You put her on a shelf, so she'll have no way to escape.
"Now watch this," you say, as you turn yourself into an exact clone of her. You smile, examining your new gorgeous, naked female body. "This should be fun."
Kristen looks horrified, but you ignore her. You go to her dresser and start picking clothes. Smiling to yourself, you pick out the pair of panties identical to the one you had turned yourself into just a short while ago. So much has changed since then. You put the panties on, then a leopard-print bra. You go to the closet and find a low-cut top and shorts, and finish getting dressed.
"All right," you say, grabbing Kristen roughly. "This is my life now. You're just here to tell me the facts about your personal life that I need to know. If you fail to follow my instructions or disobey me, well, get ready to be shoved up your own ass. So I'd recommend you make yourself useful."
With that, you shove Kristen into your right bra cup. After a moment, she climbs up so that her head's sticking out of the top of the cup. That's fine by you: you'll need to be able to hear her answer your questions. Your blouse isn't low-cut enough that anyone can see her though, so you're ready to go.
"Now," you say, enjoying your new female form. "What to do?"