Dr. Markle's POV
My assumption was correct, after just a few hours after their headache episode, the body transformation was completed. The new Frank looked identical to his original father and the new David looks identical to his old son. I've decided to proceed to phase two of the experiment, which was to test out how their new personalities will react if placed in an environment similar to where they came from.
This was not a part of the original experiment. When it was being done between two strangers who craved to be the opposite gender, the moment their body morphed completely to one another, they were free to go. With this however, considering how fast the process was and how an additional subliminal component was added for their mental transition, it's better to keep a close eye on them until then.
The facility is equipped with reality altering technology. The drinks that they have been given since the very beginning is laced with nannobots that not only served as a catalyst to achieve the bodies of one another but also they gathered brain signals and memories which were then transmitted to the facilities hard drive. We then used these to construct a seemingly virtual reality where they we can observe how they act. Given that what know about their lives is just limited to what the nannobots have gathered, some aspects in this virtual reality will be lacking, but I believe that this will be enough to test out how they will act out once released in the real world.
They both will be acting on the same virtual reality to see how they will interact with one another. Good thing the budget was increased drastically since our research about swapping genders bore fruition. Funnily enough, a lot of our stakeholders (old balding men) were interested in the mental aspect of this experiment as they've expressed their desires to use it themselves in the future. No wonder they threw a lot of cash at us for this experiment...
As of now, the two subjects are in deep sleep for the time being with the nannobots they've ingested acting as conduit for the virtual reality experiment. What's great about this is that a week in their virtual reality can easily fit in just an hour in real time, consider it as the wonders of science if funding was on our side.
As I was looking at the monitor, I saw that David, now being fully Frank, was first to wake up. "Let the games begin" I said, excitedly staying tune to our test subjects.