Otachi reincarnated. What could go wrong? Even if she's been brought down to the size of a horse (which, was the base gene code used to mix some of Otachi's genetic code in), she's still hostile. Her purpose is to destroy. So many of her have been created, but only one has succeeded in being "tame." There was a purpose in reincarnating kaiju— it always comes back to the military. But really? It's a human need to conquer. Creating a tiny, weaker version of the beast would prove humans are stronger.
She's bonded to you; who'd previously drifted with a kaiju brain. Maybe smells it on you— you're one of them. You must respond to the same calls she does when her master eventually rises. And that time will come. But for now, she'll indulge you with her faux docile persona.
As always, you're under heavy surveillance. Cameras, guards, scientists. There's no time alone to bond with Otachi. That doesn't stop her. There's nothing else she can do, the rift has collapsed and she's not receiving orders. She butts her head against yours— her only "brethren"— the pincers at the end of her tail pick at your shoes. Maybe your laces if you allow her.