The machine makes this warm feeling course through you as you black out, almost like you are peeing yourself, and you would be embarrassed, but since you black out....
..waking up, you see the pod around you, but something is wrong since it is so much bigger. Also, you realize you didn't open your eyes, can't in fact close them, and your vision is oddly 360 but still doesn't make sense. You go to get up since it feels like you are laying on the ground, and you are really disoriented as your whole self seems to change shape a bit, flowing. Raising your hand in front of your face, you see this like tentacle of silvery purple fluid form, but you can see from the tentacle as well. You would gasp, but you don't have a mouth, which is good since a scream would have followed. You're a puddle of silvery purple goo or liquid, that can pour and flow itself about, and you shimmer oddly. The machine melted you or transformed you into some sort of weird fluid lifeform or something. The door of the pod opens and you want to get out of here, so your body reacts to what your mind wants, and you pour yourself up and out the pod, and back down the hallway to the library. As you get back to the library, the secret passage closes. You are really panicked, so you flow over to the librarian whom you had been helping.
You find her, alone behind the counter, on her computer, as she had been switching over the old hard card catalogs to digital, but had to do it by hand. You try to make a sound, but can't so you simply pour over to her, as she towers above you. She looks down, seemingly right at you but doesn't respond. You are inadvertently up-skirting her, but since she is older, it's not that much of a thrill, plus you are a puddle so that is rather more your concern. Until you touch her foot, trying to get her attention.
There is a brief moment where it feels like her foot is slurping you up, as your form pulls into her. Then a weird sensation as your senses fade to nothing, but then snap back. You seem to be back to human and you sigh, which rapidly turns into a little yelp, since your voice is feminine, older. Hands come to your chest, and yep, you have breasts, and you look down, seeing the body of the librarian is now yours. Somehow you possessed her! You go to move around, but it is really awkward being an older woman, and she has heels on...if only you knew how to run this body!
You feel your eyes flutter a bit, and suddenly you have access to all of her memories and you smile, because you are able to move and stand and it all feels fine. You ARE the librarian, and can pass as her easily, even if you went home to 'your' husband. You play back the time when you were a puddle at her feet, and while you appeared silvery purple to yourself, she saw nothing, so apparently you are invisible to others. Taking stock of things, you figure that pod turned you into some sort of invisible possession liquid, but knowing what you are is at least a help. But what do you do about it?