It is indeed an unoccupied bedroom. It's fairly clear that it belongs to a teenage girl, although you're glad to see that it's not as pink and "girly" as you were expecting. It's at least twice the size of the bedroom you had as a guy, and posters of various female sports stars and models cover the walls. You've even got your own trophy case, and a quick look shows that it's not just basketball -- there are awards in there for everything from Little League baseball to academic decathlon.
To one side of your bedroom is a door that's slightly ajar. You open it and step into a huge walk-in closet, and beyond that, a bathroom. You manage to ignore all the outfits that are hanging to either side of you as you walk toward what you're seeing in the bathroom mirror.
You stand at the counter and stare into the eyes of the vision of loveliness who stares back at you. Tamara was right -- you do look like a model. Even in the nondescript blouse you've got on, you pretty much could have stepped straight off a magazine cover. It helps that your makeup and hair are perfect, thanks to Tamara's magic, but beside from that, you've got piercing blue eyes, chiseled cheekbones, full lips, a swan-like neck...
You want to see more, so you pull the blouse over your head and throw it on the floor; you then unhook your bra behind you and do the same. The last time you had your shirt off, in the shower in the locker room, your mind was racing a mile a minute, but now that you're thinking more clearly and you can see yourself in a mirror, it's almost as if --
"Told you you looked like a supermodel," says a voice from behind you. You catch a flash of black in the mirror, and you spin around to see Tamara. She grins and says, "You don't need to cover up. It's just us girls here."
You didn't even consciously realize you'd brought an arm up to cover your breasts. You drop it and ask her, "What are you doing here? How did you even get in?"
She shrugs and says, "Teleportation spell," as if it's the most natural thing in the world. "I was just going to change you from afar while you slept, but then I figured I'd wait until you got a little glimpse of your life as a girl and then give you one more chance to decide to stay this way. So what do you think? Just spend a week in this body, and if you don't like it by then, I'll turn you back to your old self."