Just...need...that...cube!
I shot a portal across from it and leapt down, wind whistling past my ears, propelling myself through the facility in what must have seemed a brilliant blur of orange. My face was the first part of me to hit the ledge, as I smacked into it full speed, and proceeded to slide down in a rather ungainly manor. I heard the ghost of GLaDOS's laughter and the static of the speakers cutting off. No fair, I thought as I tentatively rubbed my jaw with my free hand, She could at least give me some help. Or a hint. Or maybe Wheatley could get me out of here sometime soon. Ugh, why is it so far up.

Portal here, portal there. Half heartedly, I walked, jumped, paced angrily, and then just glared at the cube as a means to gain pity. Surprisingly, the final tactic worked.

"Hey, kiddo, can't help but see you want that box there."

I raised an eyebrow and looked up to my left, fully expecting another personality core. A bleached white skeleton was the last thing I had in mind, so instinctively I stiffened; my challenge face on for whatever trick GLaDOS was about to play on me. He bounced his weight from one foot to the other, his permanent grin seemed to flash. He took my suspicious squint as a question.

"Oh, how I got here? Well, like your hair, a short cut."

I resisted the urge to grab my pony-tail, and instead offered a weak smile at the (now inexplicably winking) skeleton leaning against the panels. This was no sick creation of Aperture, clearly some sick result of the outside. He dug his hands further in his hoodie.

"You don't speak, do you? You're just like our Frisk. Silent and determined, must be a human thing. I'm Sans. Sans the skeleton. Look, do you want the box or not?" he asked in a very laid back tone.

I nodded without hesitation, and his response appeared to be to make his left eye glow, and I began to shiver. This was no science that I was used to, neither was the floating. I was fixed in my position, swaying across the chamber, all power lost. Held in his untrustworthy, bony hands. I don't recall a sense of fear, only feeling ... blue, but the colour. It doesn't make sense now, but that's how I felt at the time. But the skeleton simply lifted me up and placed me apon the ledge, as I gently landed his eye went back to his ordinary pupil.

The speakers crackled into life.
"Hey, Animated Remains of the Deceased , I don't mind your little chat, but now you're ruining science for everyone. You should feel very, very ashamed of yourself."

Sans merely shrugged and looked across at me. I nodded my thanks and threw the Weighted Storage Cube at the button, and the stairs to the lift emerged. He stared a while at it, and then turned back to me.

"I need to go back home anyways, I think my bro has made more spaghetti. See you around, kid." he stated casually, before vanishing without a trace. Unless...

I shot a portal up to his previous position, and looked down. He had in fact left a trace, a lone whoopee cushion that I deflated and shoved in my jumpsuit pocket before heading up to the stairs. Halfway up they folded away and the doors shut. I landed (with a fart noise) on the floor, looking irritatedly at the de materialised cinders of the cube.

"Cheating is a terrible thing to learn from that skeleton. What you should have done was become envious of his slender frame, that way watching you test would be easier on the optic. Go on, finish the test."

I sighed, and got to work.