DPxDC My Brother in the Mirror
Damian doesn't like mirrors.
He never mentioned the fact to other members of the family, but they are detectives and vigilantes, it's their job to be observant. Which, after so many years, becomes a habit.
Damian doesn't actively avoid the mirrors - he has a mirror in his bathroom, he didn't express any discomfort over going into a mirror labyrinth at some carnival they've attended (he expressed disgust over taking part in something so stupid, in his words, but that's a whole another story), and he actually spent a few minutes in front of the funhouse mirrors when no one was looking, watching his own reflection distort in various ways. He also has no problems with his self-image - he doesn't mind pictures of him taken at any time (unless it's Tim, but that's, again, a whole another story), he's drawn a few self-portraits that were rather accurate and he liked them.
He just doesn't like mirrors. For some reason.
His family, both close and extended, never questioned it. They did some gentle research to see if the dislike was caused by some kind of problem Damian was experiencing without telling anyone, but when they found no proof of that, they've just decided it was some quirk of his. Everyone has quirks. Dick doesn't like eating cereal like a normal person, Tim despises sleep, Steph is at war with any color other than purple.
That is, until one day, Tim witnesses Damian sitting in front of a mirror.
He is not even aware of it - the whole family is having a game night, and through some arguments and rearrangements on the couch, Damian ends up sitting on the left side of it, where his back is turned to one of the three mirrors in the room. Tim, who's lost the last round, is slumping in an armchair nearby, pointedly looking away from the screen where Damian and Jason are enthusiastically competing over the first place in Mario Cart. Of course, Tim can't just not watch it since he needs to know their strategies. But turning back around would also be admitting defeat.
The solution? Easy, watch the screen through the mirror.
Which is when he notices it.
Damian in the mirror doesn't act the same as Damian in the room. Out of the corner of his eye, Tim can see the real Damian moving around, shoving Jason with his elbow, fully concentrated on the game, and yelling something. Damian-in-the-mirror is sitting unnaturally still, the back of his head over the couch unmoving.
Tim forgets all about the game when Damian's reflection starts to turn around. Slowly and carefully, eerie in the way the horror movies are, the boy in the mirror turns his head around like an owl, his neck twisting inhumanely.
His eyes are green. Green like the toxic waste, like Jason's madness, like acid in cartoons, like the Waters of Lazarus.
Damian in the mirror smiles, his unblinking, gliwing eyes fixed on Tim, and his teeth are sharp and pointy, and there are too many of them, humans can't smile this wide.
"-im? Tim!" A hand nudges him in the shoulder, and Tim looks away from the mirror, finding Dick standing over him. The noise of the game room returns all at once, and, wait, when did it become quiet for Tim?.. He must have a strange expression on his face because Dick's easy smile falls slightly, and he frowns, "Is everything okay?"
Tim looks back to the mirror, but the green-eyed boy in the mirror is gone, and the mirror only reflects Damian as he is: sitting on the couch.
"Yeah," Tim shakes his head and forces a smile on his lips, "I just zoned out."
"Okay," Dick pats him on the shoulder and gives him the controller, "It's your turn now."
Tim takes the controller and turns around, facing the screen. Tim throws a quick glance at Damian, who had slid down on the couch so his head would not be in the reflection anymore. Tim sees the cold, warning hint to his eye, a clear do not speak of it message.
Tim doesn't like that the mirror is now behind him.