Gunshots ring out as Parademons advanced on Y/N as he quickly reloads his Hand Cannon and throws 3 flaming knives at 3 incoming Parademons in front of him.

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Summary: it is the final battle, Darkseid and his army has invaded Earth (much like in the final episode of Justice League Unlimited), every Hero and Villain has agreed with joining up together to fight a common enemy.

You are a young man with extraordinary abilities who is practically immortal thanks to your powers from two paracausal Gods/Goddesses (Light and Dark) who once upon a time, fought each other before coming to a truce where the timeline would reset.

It's unknown to everyone what happened in the old timeline since there was no Justice League, just Guardians.

But at the moment, you're in a middle of fighting Parademons alone, at the entrance of where the Parademon's objective was, they were trying to terraform Earth since it was Darkseid's orders and let's just say you didn't like the sound of that.

Your objective is to shut down the terraforming weapon and make it go boom in the process.

And it was heavily guarded with Parademons on the ground and the sky.

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He then ducks down to dodge a clothesline attack from behind him, spins round and hammer-fires his Hand Cannon before a bullet hits an explosive propane tank, killing a few Parademons and sharp debre comes flying at a Parademon from behind him as he makes a 'ta-da' gesture with his free hand before double jumping on top of a destroyed Watchtower Javelin he rode earlier on.

He turns round and placed a trip-mine before firing his Hand Cannon at 3 incoming Parademons as more close in and reluctantly run into the trip-mine, killing the few that ran into it as Y/N cartwheel jumps off and slides down while killing a Parademon that charges at him in the air.

He lands and is grabbed from behind before being thrown at some hanging debre, taking a hard hit.

"yep.. That hurt" Y/N says, holding his head with one hand as the Parademon in front of him starts to pick up a piece of debre, Y/N picks up his Hand Cannon and starts getting up before getting hit by the debre the Parademon picked up, being tossed towards a Javelin wing hanging up.

With quick thinking, he pulls out his knife and impales it right through the broken wing, and overlooks the incoming enemies, he looks up and shoots the wire tangled around the wing that caused the piece of the Javelin to hang in place, he uses his knife to put enough force to throw the wing down on the Parademons below him and lands on his feet, looking at the debre he pulled down on them.

"sorry. Not sorry" he says to the dead Parademons behind him before running back out at the incoming threats, firing his Hand Cannon before sliding right under a Parademon that tried to tackle him.

As he gets up, he sees he's surrounded completely.

"well... Should've stayed home today Y/N" he talked to himself, now regretting the mess he's put himself in before he hears a grunt coming from a female as a Parademon is flung right over his head, driving the attention away from him as two red lasers then shoot out at a Parademons.

"sounds like you need some girl-power" he recognised the voice as he smiles under his hood, it was his girl bestie Kara Zor-El or in other words: Supergirl.

"I really do actually" he replies to Kara with a cocky smile as the two start to kick ass together, fighting side-by-side.

Using your Light and Dark powers and Kara using her abilities, nothing could stop you both, it was why the citizens thought you and Supergirl were a power-couple, they thought you two were dating in which it was a nice thought that made you both blush about it, you two were just best friends-nothing more... Yet.

The dust then settles, Y/N reloads his Hand Cannon while panting a little as Kara let's her guard down.

"think that's the last of them?" Kara asked.

"should be" Y/N replied looking at the terraforming weapon that overlooked the sky, he starts to walk off before Kara stops him.

"I should go with you, we'll shut down the weapon together" she suggested but you refused.

"no, you need to stay out here, keep Darkseid's forces busy with the League, my objective is to shutting down the weapon alone, I even said it myself" he looks at Kara as she hangs her head low to think. She looks back up and opens her mouth but closes it straight after, understanding what her objective is.

"ok... I'm just... Worried, about losing you" she confesses, which warms Y/N's heart.

"me too Kar, but... You know I've killed Gods, I can take care of myself, as you can take care of yourself and the League, don't worry about me... I'll be fine" he comforts her as she kept looking into his eyes and smiles.

He holsters his Hand Cannon and pulls Kara in for a comforting hug, they close their eyes to take in the warm hug before pulling back, and smiling slightly, backing off a little.

"one more thing before you go" Kara starts to feel butterflies in her stomach as he stops to look at her.

She approached Y/N with her super-speed and pulls herself into him, closing her eyes and planting her lips on his, taking Y/N by surprise with the sudden kiss which he melts into straight after realising his girl bestie unexpectedly kisses him.

He then closes his eyes, her hands cup his face as they both pull back, opening their eyes to look at each other.

Kara smiles like a goof-ball as Y/N looks at her with a shocked expression before chuckling lightly with blushy red cheeks.

"for luck! For good luck!" she says quickly with her goofy smile on her face "Now go shut down that weapon, while I kick ass alongside my Cousin and the Justice League and if Darkseid is there, I'll tell him you said wished to kick his ass" Kara lets go of Y/N as he starts to back off with a smile on her face.

"you too" he says to her before running off to his objective as Kara looked on

"Eyes Up" Kara says your monologue, while you ran off.

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In the end? The battle was won, the weapon was shut down and surprisingly... Y/N would fight Darkseid, he was very powerful and Y/N was battered yes... But you triumphed in the end, he was the end of the barrel of his Hand Cannon.

But at what cost?

Many cities were damaged badly, many died... Heroes and Villains alike, their sacrifices would not be forgotten.

The rest of the League were worried about Y/N, about the terraforming weapon going out with a boom.

"what would Apokolips be like now that you're defeated and at the end of the barrel of a gun? What would your followers think, their so called 'Lord of Apokolips' beaten by a Human with extraterrestrial powers from an old timeline, would they look at you anymore? How embarrassed you must feel right now... The humiliation" Y/N speaks coldy at Darkseid as he stares down Y/N with a cold stare.

"you cannot kill the Lord of Apokolips, I am a God" Darkseid replies.

"and I kill Gods, I've slayed many Gods, liberated and freed thousands of planets from slavery, corruption, greed, I. Am. A Guardian. And you are just another God for me to put on which God I killed list" Y/N replies as his finger itches on the trigger.

The rest of the League were now approaching... Well, the ones that could fly atleast, Supergirl was also with them since she was worried about him the most.

They land inside the crater and debre of the world-ending weapon, only to see a hooded figure approach them which Kara immediately identified it was Y/N as she quickly rushed towards him to check in him as the others then look behind him to see Darkseid, on the floor...

Green Lantern (John Stewart) and Superman approached Darkseid as Wonder Woman checked on Y/N with Kara before the rest of the League arrived along with Batman.

"he's dead" John Stewart confirmed Darkseid's condition to which Superman looked shocked as he also checked for vitals, only to see a bullet hole through Darkseid's head.

Only one person could've killed Darkseid... That being Y/N himself.

"I pulled the trigger... I saw the opportunity, to finally put him down... I'm... Sorry if that... Disappoints you all" Y/N says to everyone, hanging his head low.

"no" Superman replies, Y/N looks back up to face him, "you did the right thing" He acknowledges Y/N.

"good... But, there's one more thing... You don't mind if I-" just as Y/N was about to finish, Kara makes him look at her and plants her lips on his as everyone looked on with mixed reactions, most of them were shocked while some where happy and a few boys were jealous.

Kal stares in disbelief to see his cousin smooching Y/N, he smiles since he knew this moment would come for Kara.

He knew how much Y/N meant to her, she was afraid of confessing her feelings to Y/N so... She asked him and his Wife Lois Lane for help.

Y/N and Kara pull back from the kiss and look at each other, not caring about the others looking at them.

"you don't mind if I take your cousin out for a Date?" he finished his previous question.

"as long as she's happy with it" he replies as Kara looks at Y/N with a delighted look on her face and plants a smooch on his cheek.

That was mere 4 months ago, Kara thinks all the way back to that day, not just to remember the first kiss they had but... To remember the Heroes that fell and Villains who redeemed themselves that sacrificed their lives to save lives.

The world healed, cities were slowly being repaired with the Justice League's help.

Kara was now a full-time Justice League member and Y/N joined alongside her to be by her side no matter what happens since they made a perfect power-couple.

At the moment however, Y/N and Kara were in the bedroom, smooching under the bed covers after their long session of sexual contact for the second time after a month.

"have I told you how much I love you?" Kara asked pulling back a little.

"many times" Y/N chuckles.

"I love you" she giggles.

"I love you too" Y/N says back, pulling her down to continue smooching for the rest of the night...