As the dizziness passed, Jeff attempted to reach up to his head, only to quickly realize that not only were his limbs unresponsive, but he didn't have limbs to begin with. Combined with the foreign (but now-familiar) shape of his body and the strange taste of his "mouth", it was not hard to figure out he was now his own vagina, again. He also was now covered by his own clothes, given how dark it was. Though seeing darkness was much better than literally having no vision at all.
Suddenly, he hears his own voice speaking from above, not in his head, but vocally. "Hey, uh, I'm uninstalling the Chronivac, and that means the timer set for you down there won't work. It asked me if I want to undo the change, but I chose instead to change you back manually later."
It was at this moment that Jeff realized what it means to not have a heart of his own -- the stress and fear of being potentially stuck as his own vagina did not come with the expected jump in blood pressure.
Of course the Chronivac had to be uninstalled. Though he was 18, his mom ran the household rule of "my house, my rules". And like some other things, Jeff ordered the Chronivac without permission. Given the Chronivac's capabilities, he doubted that his mom would allow him to own such a device. Besides that, his little sister was likely to make good on her threat earlier about telling their mom about the Chronivac.
Suddenly, Jeff felt his world shifting, as his own legs started moving around, and thumps can be heard echoing on the floor far below him. He already knew what was going on, as he had planned ahead. He... or rather, his "host", was likely stashing the Chronivac device on the hidden shelf under his bed. Then there was some more movement, before his "host" sat still.
Moments later, Jeff heard his mom's voice. A little muffled from his location, between his own legs and stuffed within a pair of underwear and jeans, but still audible enough. "Jeff?"
Jeff tried answering out of reflex, but again, he had no muscles (or breath) to do so. But his "host" was there to answer for him. "Yeah?"
"Melissa says you're up to something, again. Spill the beans."
"There's this web site called 'Chronivac'. It's a fantasy site where people talk about being turned into different things."
Jeff heard his sister chime in. "See? I told you he was doing something weird."
His "host" responded. "It's only fantasy, though. Nothing wrong with it."
There was a moment of silence before his mom responded. "Well, just don't get yourself into any trouble."
After some more silence, Jeff assumed that his mom and sister had left his room. Meanwhile, his "host" remained silent, probably to avoid being heard "talking to himself".
It was strange, hearing a conversation between his own voice and his family from an outside perspective. Certainly not as strange as being your own vagina, when you used to be male! But it really wrote home that he and his "host" were now separate identities. Both are technically the same person, but only one is assuming the role of "Jeff", right now. And currently, that wasn't him. He was just a vagina, now. Hopefully not forever. Probably not forever. If there was anybody he could trust to change him back to normal, it was himself. Especially knowing his "host" was just as interested in knowing what it was like living as a vagina. Gotta merge his conciousnesses back eventually.
For now, Jeff decided he might as well get into the role. For at least the next day, he -- or rather, it -- was no longer Jeff, but "Jeff's vagina". His SECRET vagina.
Jeff's vagina would've chuckled in excitement, had it been physically capable.