Awakening inside a new host.

I don't know how much time has passed until I suddenly feel an external **** pulling me back from unconsciousness. It doesn't come organically, and it surely doesn't have anything to do with my own free will. Instead, it drags me out into a hazy light, imposing an unending wave of continuous dull pain and confusing echoes beating through my ear canal.
My senses are slowly coming back. But, are those really my senses? It's like they're being registered from way too far away, in a scope way too big and foreign to be coming from my own little body... and they keep getting worse, wider, more intense.

As my vision falls back into a more comfortable darkness, and a uniform, unending and exaggeratedly loud echo attacks my ear canals, I get hit by the worst part yet: the part where I 'regain' the sense of touch.
It's like my awareness explodes in all directions, forming thousands of tendrils with my meager parasitic main body as the center. However, each and every single one of those tendrils delivers a little stab, a stab not felt with pain, but something way worse: tickles.

I suddenly find myself being attacked from all fronts by an overwhelming wave of tickles from which there is no escape or any a way to fight it. I can't even squirm to somehow withstand this ungodly ****. Although, oddly enough, I do possess the reflex of screaming. Where did it come from...? Ever since I became a mutant slug I lost the ability to scream. Well, It doesn't matter now, because that's exactly what I do.

My blasting wail which contains all my suffering combined... ends up sounding rather disappointing. The only sound that actually comes out is a gurgling croaky noise accompanied by a faint feeling of something vibrating somewhere in my throat.

Wait... do I have a throat?

As the tickles grow in intensity, at some point they become unbearable, and my mind shuts down for a while to prevent me from going crazy.
At some point, I slowly regain consciousness, but the **** is still so bad that I'm unable to form complex thoughts.
However, it doesn't take long for those tickles to start losing intensity, as if they'd already crossed the peak and it is time to descend over the other side. And as they do, I start feeling other sensations through my shifting senses: some movement in my middle section, air pumping in and out from a cavity over my front. I feel a rub over my skin as I finally become able to shift uncomfortably. And as my ears unclog themselves and the tickles get substituted by a rather pleasant warmth, my vision finally returns, filling my whole range with a hectic blur of restless shapes. But as my awareness evolves, I realize that those shapes aren't really moving, it is actually me who's twitching from side to side. Or rather... my upper part. Is it my... head?

It feels so heavy... and solid.

After a few minutes of constant adaptation, my senses finally seem to settle down. My ears are fully unclogged. My vision, although still quite blurry, is now stable and functional. The tickles have disappeared save from a residual tilt right at the tip of my limbs and there is a persistent dizzyness in my upper part.

I blink once, slowly, adding moisture to these eyes that don't feel like my eyes at all. Then, I look to the side, shifting both my eyes and my entire upper part in an unexpectedly wide movement.

...What is happening?

I'm now looking at a human arm, departing from a gigantic shoulder right under my point of view and extending for a great distance, ending in an open hand of pale skin lying far from where I currently am.

I think I recognize this arm... but why is my point of view so twisted?

All of a sudden, there is an unexpected shift in my brain that directly affects my scope of perception and sense of dimension. For a moment there I feel like I'm falling forward, causing me a surge of vertigo. But once it settles, I can't help but blink several times in astonishment. This... arm, doesn't feel huge anymore. It's like my point of view has been completely calibrated in order to fit with my new size.

I don't know what is happening to me. Everything feels so wrong and strange. It's like my whole frame has been totally reconstructed and I'm not a slug anymore. Instead, I'm bigger, more solid, firm flesh over hard bones instead of the usual slab of gelatinous springy meat that formed my entire physique.

However, I don't panic. Instead, I try and see if I can actually move.

With a faint thought from me, that pale hand in front of my eyes bends upward and clenches its fingers.

Ah... so this limb is actually part of 'me'. How strange... but, isn't this hand vaguely familiar? I've definitely seen it somewhere.

"......uuhhhhhhhh.........." A faint gurgle that vaguely resembles a voice comes out from the same hole the air is circulating.
Wait, I know it! This hole is none other than a mouth! My mouth!

I immediately decide to be bolder and try something that was unthinkable a minute ago: I focus on this arm with the intension of completely raising it above the mattress. The process is slow and the weight shift catches my by surprise, but all in all I'm fairly successful, and I end up getting the shaky limb to bend inwards and even employ my new hand to gain information by touch, clumsily rubbing my mouth, my cheeks, chin and that meaty protuberance that feels like it might be the nose.

"....aaauugghhuuuuuhhhh...."

I'm still not coordinated enough to form actual words, but I can finally hear a distinct voice coming out from my new throat. And it's that voice what trully sets off the alarms.

The memories are now coming back. I... remember, what I did last night.

I think I know who this body belongs to.

"...aAAaaugheeeck... Ebuh... uh... Eubbhiihhh..." I become agitated. My lips and mouth moving in complex ways while trying to form a single word: the name of the person I fear and hate the most.

Emily.

The last thing I remember is me burying my slug body right into her brain. And now... and now...

I'm suddenly shaking. Before I know, my head has shifted back up and I'm now staring at the blurry ceiling illuminated by the morning light.

"Aah... Haahh... E-... Eeeemmiiiiibhuiiiihh..."

I've... possessed Emily. I've taken over her body.