Prompt:
(Mythical AU(?))
Katsuki and Kirishima (both are just close friends in this story) have lost their way in the forest. They're both literal knights in shining armor- both too injured and exhausted to move as they collapse into a seemingly innocent forest clearing.

What would happen when they stumble upon a powerful forest spirit?

(A/n: I HAVE HAD THIS IDEA STUCK IN MY HEAD FOR DAYS I JUST HAD TO LET IT OUT.)
———

"You're such a piece of shit-"

Katsuki coughed, collapsing on his knees as he quickly pushed the heavy metals off of him- as if they were burning through his skin like fire. He heaved a heavy huff, the lack of armor leaving him in a black tank top and uncomfortable skin-tight leggings.

Kirishima let out a manly groan, kicking his armor plates off as well as he practically buried his overheating body in the cool, dew covered grass.
He grimaced as he felt his side throb painfully- it was probably a new bruise he had obtained from falling off of his horse.

They both came from a war-damaged kingdom at least thirty miles away- traveling solely on two white horses, before the idiot animals ran off and left them to die. Kirishima was on said horse when he fell, before being carried by an already exhausted Bakugou a mile more before they both ended up in the heart of what they called the tall-tree forest.

It consisted of what the name said- tall grooves of trees and spiky groups of bushes- a forest where sacred animals and "divine beings" rested together in peace.

Of course, Bakugou doesn't believe that utter bullshit.

It's childish, he reminds himself.

Nymphs, faeries, vicious forest spirits- they were all made up by Aizawa (their superior) to scare the shit out of them so they won't go wandering off to the west where criminals lay low and get themselves killed. Kirishima, though, always pushes that they're real, breathing godly beings that made the said forest home.

They have been participating in a surprise ambush that was carried out in their city- all of them caught off-guard at the attack of a neighboring Kingdom. It was a short notice for them, coming unprepared at a fight.

But they still fought on for two days, though, holding up a good fight against packs of demon dogs and hell biters- a name given to people who are driven to war solely to see the bloodshed going on. Crazy fuckers.
But then came the time to retreat.

Their numbers were decreasing at a fast, steady pace when the other side brought out a new weapon of war- a Nomu.

It was classified as a giant with super strength and surprising speed. The downside is- it's one ugly bitch. It had it's brain showing repulsively, muscles resembling a humanoid version of body builders, complete with ugly sharp teeth that could rip you apart and two unfocused, unblinking eyes.

Aizawa quickly sent messengers to carry out the word to retreat.

But Bakugou didn't want to retreat- even though it was obvious that he was already tiring out, so Kirishima was forced to knock him out and technically kidnap him to bring him to safety.

"Motherfucker! I coulda handled it!" Bakugou grabbed the nearest thing- a water bottle- and violently chucked it at Kirishima's head with all his strength (or what was left of it).

Kirishima anticipated the hit, and rolled to the right in time for the bottle to impale the soft ground beside his hip. He frowned at Bakugou, furrowing his eyebrows. "You were tired, dude. You couldn't have handled it."

"Fuck You! I'm not a fucking coward like you-"

Kirishima felt his blood boil. Coward? He saved Bakugou from certain death! He risked his own life by charging in the middle of the battle field to grab him by the collar and haul him out of a hoard of chaos.

He doesn't know if it was the lack of sleep, water, and food that drive him to do it- but he snapped, "Coward!? Bakugou Katsuki, You were almost dead from exhaustion! I saved you!" His words had every bite in them, bitter resentment towards his friend made his own stomach coil.

Somehow, saying those words left a nasty taste in his mouth.

Bakugou was taken back, his scowl morphing into an angry one. His eyebrows creased together, a growl ripping from deep in his throat as his canines dangerously glinted.

They were both thirsty, hungry, and roughed up- and maybe just a teensy but delirious, because the next thing that happened was uncalled for.

"If both of you destroy my forest, I'll personally use your decayed corpses as fertilizer."

————

Bakugou woke up by water being splashed onto his face- his first instinct was to release an embarrassing, inhumane screech as he sat up immediately.

"FUCK! FUCK! SHIT!"

His curses filtered out of his mouth like second nature as he felt the drops of chilly water pour down his chest- seeping into his clothes.

It was so fucking cold!-

Bakugou blindly made a grab in front of him, before blinking away the freezing droplets out of his eyes. He could make out a blurry, blurry figure of green, along with yellow, pink, brown smudges around his vision.

"Bakubro! You're awake!"

He blinked owlishly, before his eyes flared at the sight of Kirishima with a wool blanket draped on his shoulders. He also had an empty, hand carved, wooden bowl that he had used to pour water onto him.

He had a big grin on his face, unnaturally sharp teeth bared in a friendly manner.

The second thing he saw was that they were in a tent of some sort- the flaps were made out of light-brown leather, and the rest was just cotton weaved together with vines. It was big enough to contain five people.

What caught his eye were little trinkets hanging from the ceiling- necklaces made out of colorful, vibrant stones, and flowers hanging from vines creeping and somehow sticking onto the wall. The tent was lit up by a single flaming torch hanging idly on a metal holder on the wall.

Katsuki blinked dumbly. "Where the fuck-" "I honestly dunno! I woke up with food and a blanket beside me! So I ate it. I guess someone nice brought us here-"

"YOU FUCKING IDIOT!" Katsuki yelled, kicking the admittedly comfortable woolen blankets off of him. He dully noted that his legs didn't ache anymore. "YOU ATE THE FOOD FROM A STRANGER'S HOUSE INSTEAD OF BOOKING IT!?" Katsuki was exasperated, sweat trickling down his jaw.

Kirishima flinched, eyes darting around as he pursed his lower lip. He also seemed to realize his mistake. Good.

"I-I.." "GODDAMN IT SHITTY HAIR!-"

"Could both of you please stop making such a ruckus?"

Katsuki flinched at the foreign voice, doing a 180 degree turn and backing up cautiously with a snarl. He didn't know what the fuck the stranger wanted, and he sure as hell ain't giving it.

But his eyes widened, along with Kirishima- who dropped the wooden bowl in surprise.

There stood before them was a.. Person..?

He had a wild mop of green hair, a pair of emerald-moss green eyes matching with it. The stranger, Katsuki noticed, had an impatient scowl (pout. It had a pout.) on his face.

The wildest thing was that he had vines curling around his arms and body, colorful flowers sticking out of the said vines. He was bare chested- a large "X" shaped scar lined his pectorals, along with other faded ones on his torso. A thin cloth wrapped around his prominent hips as a sashay.

.. He also had white deer horns where vines and flowers curled around.

The stranger took the shell-shocked look on their faces as an opportunity to give a dazzling smile, making Kirishima blanch.

No fucking way.

Eijirou hacked his lungs out behind him, smacking his chest as he choked on his own saliva. Holy shit. Holy fucking shit. He stuttered, gasping and clearing his throat as he looked at Katsuki for help- who was unfortunately rooted into his spot.

"Um.. Are... I.. What-" Kirishima almost smacked himself at the starstruck bullshit he just uttered. Way to go fooling yourself in front of a handsome fucking god, Eijirou.

The green-haired teen (he looks like one) had soft curves, a doe-like appearance if it wasn't for his muscular thighs and torso- the foliage wrapping around his arms badly concealing those strong biceps that looks like it could give you a good lift. His face- holy SHIT his face. He had a killer jaw, and faint freckles that dusted over his cheeks and nose like stars in the night sky.

"I'm a forest spirit," The stranger interjected politely to save Kirishima from further embarrassing himself. A small smile played on his face, his fingers fiddling the fabric that hung around his hips. He too, was indeed nervous. I mean- he was meeting humans for the first time in years!

And Bakugou- Bless his fucking idiot heart- uttered the first thing that came into his mind. "You're hot."