There's really not much to do in a large, featureless cage, and most everybody is too preoccupied with their predicament to want to talk, so you resort to the prisoner's favorite activity: milling about aimlessly, staring at your feet. This goes on for several hours until suddenly a pair of breasts moves into your field of view. Looking up, embarrassed and wishing they'd left everyones' clothes, you find that they belong to a cute young black lady. "Hi," she half-smiles. "My name is Rachel."
"Hi," you reply. "I'm Jake." You make a concerted effort not to stare at her.
"It's all right," she says, with a little laugh. "It's not like we can help it, given the circumstances." You smile and nod. "So," she continues, "what do you think they plan to do with us?"
You shrug. "I dunno. No way to tell, really."
She nods. "Yeah, I suppose. I kind of thought-hey, here they come!"
You look where she's pointing; sure enough, about a dozen men in lab coats are standing outside the cage, one clutching a bullhorn. Everyone falls silent as he begins to address you.
He explains that you have been "selected" to participate in a test of a new bodily transformation serum. Unfortunately for you, this is an all-out test, which means your body will change completely. In other words, you're going to change sex and ethnicity. He claims that your sexual orientation will be retained, except that this apparently means that heterosexuals will remain heterosexual and homosexuals will remain homosexual, though the change of gender perspective will take place as gradually as the rest of the change. The change, he says, will take place over a month, after which time behavioral experiments will be conducted. Finally, you'll be conditioned to accept your new body, and released into the world as the new you, with all your posessions and finances.
No reason for these exeriments is given, but the cage door opens and you are ordered to make a single-file line out the door, to where the injections are given. A few people try to resist, but they're tranqed and given an altered formula you don't want to think about, so everybody else stays in line. When your turn comes, a needle is shoved into your arm, the contents are emptied into your veins, and you're given an ID card on a lanyard depicting your target form. You stare at yours and Rachel stares at hers for a long time.