The injustice of it all (Male reader x Supergirl)

In the clouds

Although reputable, Ivy's fighting skills were no match for the combined might of y/n and Harleen. After a successful battle, they shared a sit bump.

Harley Quinn and y/n: Best friends forever!

Harley turns to the incapacitated Ivy-

Harley Quinn: No more sleep-overs for you!

They run over to see Green Arrow and Black Canary choking in fear gas. Then Scarecrow walks over and sprays some more of the gas t y/n and Quinzel.

Scarecrow: Face your fears...

Harley inhaled the gas through her nose and then sneezes Please! I used to huff this stuff for kicks!

y/n however is not having such a good time, in the blink of an eye his surroundings change drastically. He now stands in a barren wasteland, the air tinted orange. Around him, buildings lay destructed around him- Metropolis. Out of nowhere- a blue blur rockets past him and screeches across the floor before coming to a stop into a seemingly pre existing crater. He goes to walk over but someone beats him to it- him. An exact replica of y/n Wayne rushes to the mound of blue which now appears to be a woman in a Superman costume. He discards his ask which lands at y/n's feet

Other y/n: Kara? KARA!?

He cradles the girl apparently named Kara in his arms, y/n had no idea ho this person was but she obviously meant a lo to the other him. Tears flow down the other y/n's eyes as his breath hitches in his throat. His eyes slowly rise, rage evident, he now matches his steely gaze with y/n.

Other y/n: This... IS YOUR FAULT!

The mimic lunges at y/n...

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Meanwhile, back in the real world...

Scarecrow: Then you'll appreciate my new formula. 

He sprays Harley with more fear gas.

Harley Quinn: Hey... 

She falls over, Harley gags as she looks up to see an even scarier Scarecrow.

Scarecrow: You have a high tolerance...but everyone has SOMETHING to fear.

Despite being doped up on fear gas, Harley shows that Dr. Crane is no match for the former clown princess of crime and beats his ass without Nightwing's help.

Harley: Ugh...instant hangover...

Scarecrow: We're not...done yet...

Scarecrow throws a gas bomb at Harley's feet. The smoke envelops her as she collapses...

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The battle between the y/ns was becoming increasingly more fierce and brutal. y/n had been sliced and stabbed beyond measure, this copy was for too aggressive- ready to kill, this couldn't be him... could it? No, y/n was no killer. y/n slammed his fist into his mimic's armour and heard a sharp snap indicating broken bones. He hadn't noticed, but their armours weren't exactly identical. The red plastic that peppered the real y/n's armour was nowhere to be seen on the copy's- only cold hard gold against the same old black. y/n was on his lat legs, his duplicate lightly backhands him- sending him to the floor. He prepares to deliver the killing strike- before he is flung across the city. y/n's saviour was none other than Kara.