You are either a man or a woman who's been captured, and is being used as a test subject to find out how certain species of animals mate, but in anthro form. The testing also includes Mythological animals, sci-fi beings, and both can be considered anthro if the option is preferred over the feral counterparts. Testing may also include tests that switch the genders of the two subjects in order to see how the two adapt to their new genders as a whole, as well as motivation to mate if needed.
Anyways you wake up ass naked inside a large chamber with another human being who is also ass naked, but is the opposite gender. The two of you look to each other, and blushed turning your backs to one another due to your nudity. Eventually the other human walks up to you, and asks,"Do you know why we're here?" You shake your head in response, and state,"I am just as confused as you are, by the way who are you?"