After you sudden mental break down, you not longer felt the T-rex was in heat, so you could only imagine she was pregnant; so it was a mild blessing for not having to experience that again, but it meant you weren't getting much to do or think about, trapped as little more than a living sex organ only getting a break from the long hours at staring at forest, ground, and dinosaur tail by the regular streams of piss that came every so often.
To try to keep your sanity, you tried to remember as much of your life as you could, every single detail; even making up whatever details you imagine must have happened to you at some point even if you couldn't remember them. Everything from movies to what might have been... Even what you hoped to do with a lover, and to a mixture of relief and horror, you found you could still get aroused as a scaly lizard vagina about the thought of being attended to by a human girl.
When you began your mental recaps however, your mistress began acting strangely... Ranging from pacing as if deep in thought, to reacting to the things you see happening behind her as improbable as that seemed. When you began to rekindle your attraction to females, she made a sound that she'd never made around you until then...
...Laughter.
From then on, you had this distinct feeling she knew everything you were thinking. After all, through the nerves that make up your new existence, your mind is probably hooked up to her mind directly... Well... About as directly as a vagina is hooked up to one's brain.
It only got weirder when you started having invasive thoughts; at times as if she was feeding you something like a wordless question, and every time it happened, you got flushed as if in arousal... Perhaps that was the only way she could communicate with you, through what you could only guess was sexual fantasy.
For lack of anything else to do, you often find yourself trying to solve whatever practical problem she seemed to have; and if it was helpful she's try to reward you by fantasizing about some human girl still being attracted to you despite your... Current predicament.
It seemed clear after a point what she seemed to be trying to do, she was trying to make fire using your limited knowledge of how to make it, but the tools you knew of weren't entirely suited to a short armed T-rex. At first it wasn't clear why, she still ate meat raw... But then after a large explosion in the distance, and the chill of the air against your lips you realized... She learned from you what was going to happen to her... And she was afraid.
---
It was a rough time trying to coordinate after that. Life as a vagina was only just becoming bearable, and now you had to help the two of you fight for you life when the only thing you could do to help was think for her.
If what you remembered of the Ice age was anything to go by, it shouldn't be immediate, more a slow progression into colder years; and if the two of you- Well, mostly your girl who's vagina you were stuck in- managed to keep traveling south during the warmer months, you should make it to somewhere you could survive long term for many generations until it warmed up again.
Too bad it occurs to you that you might not see it.
Barely a month after you were pounded by the tyrano-dick, you began to leak. Your lady, knowing what was bout to happen squatted herself down on a makeshift next, and soon your entire body pulsing with both pain and pleasure as you felt yourself being stretched to your limits all the way down.
You mentally alternated between screaming internally, and relief as each egg move past, towards the end it felt like you were going to be pushed past the brink of sanity, or just straight up have a lizard orgasm right there. You must have laid about two dozen eggs.
Thankfully, it seemed mercifully short. But a lingering sensation seemed to emanate from the eggs... It almost sounded like some kind of mental screaming.
In somewhere between hope and horror, you realized you've somehow managed to give birth to a new generation of human minds trapped inside lizard vaginas. Perhaps they would be a mild company to pass the time while you're stuck like this... Or perhaps you've inadvertently doomed others to the same fate as you despite you not really having any input on the matter.
Your partner's only input on this is to make you fantasize about how you may get to romance these pussified humans, as the dino they're embedded in sways her tail in front of you, and your hosts are gracious enough to let you "kiss", as your sloppy when vaginal lips rub against each other.
But for now... At least you have something new to think about... and until your partner goes into heat again, that's really all you can do.