A/n down at the bottom

"I will destroy the Titans!" Fresh-out-of-middle-school Eren shouted to the sky.

"E-Eren! They'll hear us!" Armin nervously glanced around the rooftop they were sitting on.

"I hope they do! Then they'll know I'm coming for them! And they will tremble in fear."

"But we don't even have Mikasa with us! Think rationally, Eren! They will crush us!" Armin hated the words coming out of his mouth, but he knew they were true.

Eren looked at Armin with a glare that could curdle milk. "I can never forgive them for what they did to Mother."

Armin hastily reminded himself that Eren wasn't mad at him. "I-I know what they did to Mrs. Jaeger, but-"

"I WILL KILL THE TITANS!" Eren screamed at the top of his lungs.

"S-stop! They'll-"

"I WILL RIP THEM APART LIMB BY LIMB AND DISSECT THEM WITH A BUTTER KNIFE!"

"G-gross-"

"AND THEN I WILL ARRANGE THEIR BODY PARTS IN A WORK OF ART!"

"Oh my God Eren, this isn't Psycho-Pass! Shu-"

"AND THEN I WILL-"

A dark shadow jumped from a nearby building, vaulted over the fence and landed on Eren's chest. Eren screamed like the little girl he was when he slammed to the ground. Armin was already half-way to the door before he remembered his friend was in danger.

"So you're the shitty brat making all this noise."

The teenager standing on Eren was not a Titan, that much was clear. He was too short, and wasn't wearing a letterman jacket. Wings had been printed onto the back of his jacket, obviously a symbol that Armin didn't recognize. A short flick blade was held almost casually in the teenager's hand, and Armin's stomach dropped.

'C-can I save Eren? That guy looks really strong! B-but I have to!"

Eren struggled to sit up, but the asshole on his chest just put a foot on Eren's forehead and held him down. Curses spilled from Eren's mouth like Niagara Falls. The teenager just looked at him with a painfully bored look.

"If you don't want to die, I suggest you shut the hell up," he said in a dull voice.

Eren, seething in anger, told him where to go and what to do once he got there.

"A mouth like that will get you-"

Armin roared as he swung the metal pipe at the attacker. He gave all of his power into this one swing, the swing that will save them both, the swing that will decide their fates-

The teenager side stepped out of the way. Armin tripped over Eren's body and toppled over him, hitting himself on the head with the pipe. The teenager stood of both of their bodies.

"Like I was saying before I was rudely interrupted, a mouth like that will get you disemboweled in a sewer one day. And I might just be the one to kill you, if you don't shut the fuck up."

Armin made a noise that was between a cry and a squeak. Eren couldn't make a noise because Armin's knee was down there.

"Yo, Rivaille, leave those poor kids alone. We have trouble," someone called, too far away for Eren and Armin to see.

Rivaille stepped off his mountain of teen angst.

"Y-yeah! You better ru-" Armin slapped his hand over Eren's mouth.

Rivaille lazily looked over his shoulder. "You say something?"

Armin shook his head. The teenager shrugged, jumped over the fence, and dropped from view. Armin and Eren scrambled to their feet and peered over the fence, just in time to see Rivaille roll to his feet, perfectly fine.

Armin felt his jaw unhinge and fall to the floor.

Yo. I'm not all that good at fanfics, but hey I tried. Sorry for it being so short, but this is just the prologue. And it gets better from here on out, I promise.

Parkour: It's the art of overcoming obstacles, usually in an urban setting. Because 3D maneuvering doesn't exist in real life, I will use this as a substitute. But don't worry parkour is amazing, you have no idea.

I need more ideas for pairings, cuz it won't just be mostly ErenxRivaille. And I also need names for some of the titans. Preferably ironically strong-sounding names.

Ciao, don't forget to RnR becuz I don't know what I'm doing hahaha.