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Happiness was made to be shared

Summary:

After those weird slugs invaded Earth, they made it their mission to share happiness with everyone, no matter the means. After trying to survive being infected by the aliens, our protagonist finds her brother with a blank stare and an uncanny smile.

Notes:

This fic was strongly inspired by but not set in Ottohavingdeez's original Human Domestication Guide Slugfini AU.
(Check her out at archiveofourown.org/users/Ottohavingdeez)

(See the end of the work for more notes.)

Work Text:

Fuck.

 

Of course it'd be my own damn brother, the asshole. Just had to get caught by one of those things. And now I can only squirm and kick at him as he holds me down on my bed, propping me for infection.

 

"W-we just want you, to be. happy, with us, sister." 

A voice unlike his own. If I wasn't crying, I'd spit in his face. No. He's gone now. Got to accept that. I'd spit on that monster's borrowed body. That's better.

 

Unfortunately, those useless, tantrum thoughts don't help me escape neither my situation nor the warmth that my "brother" vomited on my cheek. It pauses, perhaps searching for my ear, giving me the exact amount of time necessary to process what is going to happen to me.

 

Bile rises to my throat as the piece-of-shit alien finds my ear.

And enters it.

 

I flinch, and the tears flowing down my face quicken their pace. It doesn't hurt, not in the way being punched or stabbed does, but it is an intrusion into a place not meant to be intruded upon. 

 

It is a living thing wriggling around, pushing itself like a worm through dirt. And it feels so damn wrong.

 

The way it's fucking squirming seems to reverberate around my skull, the disgusting, residual slime it lets free around my ear canal, as if it were marking me. Unfortunately, I know the real marking is yet to come.

 

So I struggle. It doesn't matter how uselessly, because I know I must struggle, because. this. is. wrong .

 

"C-calm down, sis-ter. It's going to get. much better. soon. please, calm-"

 

"SHUT THE FUCK UP, YOU'RE NOT MY BROTHER, YOU'RE A FUCKING THING, A SLUG, A, A FUCKING-"

 

The thing that is pinning me down, using his full body weight to keep me in my place in the bed, puts its mouth right along mine. I bite down on his lips, hard.

 

He doesn't even flinch. neither does the slug, as it starts squeezing itself past what I can already tell is its last barrier. It's this, and then the brain. I don't have much time left. I completely break down.

 

Any facade of a bravado I had previously is shattered as snot runs free across my face. I'm done. I'm dead. I'm dead. It's over.

 

"I-it's okay... we. love you.." His mockingly comforting tone doesn't get through to me, but as he realizes I can no longer resist, he pushes his lips against mine once again.

 

"We'll. share all our. love. it's going to get, better."

 

I can tell he's trying to throw up something else. He contracts his throat over and over, helping one of those little monsters out. And in a smooth movement, it passes through his throat and over to mine.

 

As it does, I feel a loud *pop* inside my head, but no matter.

 

Naturally, I spit- Naturally, I gulp it down.

Huh?

The fuck.

Oh. It got there, didn't it? Right to the brain.

 

Come to think of it, yes, I can feel it, sliding across it, mapping out every wrinkle, every space inside my skull.

 

It feels horr- It feels wonderful. Even that moment just now. I don't know if that thing has teeth, but the way it just cut off that unpleasant thought. God. I'm feeling good, aren't I?

 

Above my thighs, I'm starting to dampen, and suddenly I realize that the thing pressing into my midriff is my brother's dick. I really am feeling good, fuck.

 

A jolt of pleasure dances down my spine as I feel the parasite that entered through my mouth bite down somewhere inside me. I feel warmth emanating from that spot, the blood inside me now carrying some sort of chemical.

 

I can barely take it, but I remain calm, I know I can get through this, somehow.

 

A mischievous smile forms somewhere inside my skull, and after yet another bite, I'm forced to spread my legs, now leglocking what was once my brother.

 

"You can do it, pleasure will make you happy, won't it? Let yourself be happy. For all of us."

 

The voice makes my ears ring. It is as though those were my very thoughts, but they're spoken with such love...

 

Fuck it, might as well. I'm horny and this thing isn't my brother anyway. After I'm done, I'll feel better, yeah, that way I'll be able to get rid of the thing inside me.

 

I bring my hips up to him, and feel a zap the moment my clothed crotch makes contact with his own.

 

"Such a good girl. You see that being happy is what matters now, right?"

 

"S-shut up." I respond out loud. The being atop me watches as I continue to grind him, barely an expression on his face. Whimpers and sounds only an animal could make are all that come out of him. Though I know I'm not the one causing them.

 

It must be the same for him, surely. To tell the truth, I don't feel that much from my crotch either.

It's all the bites.

 

The way the slug clamps down on my mind at the same rhythm I use on my brother. The fog that overtakes me as I grind harder and harder, the feeling of teeth, each the size of a needle, breaking and tearing at my brain.

It's so fucking maddening.

 

Even the one on my stomach seems to be writhing in pleasure. The little guy keeps pressing down his teeth and moving himself around, not quite biting, but more so scraping my insides. I guess he wants some action too, huh?

 

I'll let him. This sort of happiness should be shared, anyway. And besides, it adds yet another sound to my cacophony of pleasure. So many writhing bodies, moving themselves purely on instinct to please and be pleased...

 

I feel the gasps of breath from my brother's body are becoming shorter and shorter. It seems he'll be done soon. But that wouldn't do, that'd leave us alone. We must finish together, we must share this happiness too.

 

I make myself gag intentionally, trying to get the little slug in my stomach out. It's done its job, after all.

Bringing it to my mouth, I open it to show my partner that I want him to feel it too. He advances, licking the slug out of me, and into him. But our lips remain locked, our tongues playing with each other.

 

I know he's closer to finishing than me, but I still want to finish together, I really want to-

 

Bite.

And static overwhelms my head.

 

My body is no longer my own as it spasms into my brother, my limbs are not my own my mouth is not my own my eyes are not my own my pussy is not my own my stomach is not my own.

My brain is not my own.

 

I cum harder than I've ever dreamed I could cum. He does too, as I can tell from his eyes, still rolled back and spasming like I was.

 

I caress his exhausted body, letting his head rest on my chest, and then we speak to him.

 

"I-it's okay. We're happy. We're, happy and, together."

 

One last bite. As a reward, perhaps, for learning our place. For joining their mission, to share happiness.

 

With the rest of the world.

Notes:

I’m sorry for the incest, I swear idk how it even came out like that.

But also this is my first fic ever, so I hope you liked it or found it mildly amusing. I’m still happy anyone would bother to read it in its entirety so mwah mwah tysm.