What have I done?
There was no covering up this… this mistake. This… lapse in judgement. Oh, god. Oh no, oh god. They were going to…
...be fine. Be fine. It would all be fine, they were the enemy after all, weren't they? And now… now, now they could go home. Mission completed. Monsters defeated.
But no, no, no, "Mom…? Dad…?" Their shaking voice escaped them as they reached out to touch the dust, reached out to the shaking hearts, there for but a moment. Unsuspecting, always trusting, their child their human child they loved you and you betrayed them. And then they shattered.
Wide eyes turned to the dust. All that remained of their parents.
They had been raised to kill monsters, and at last they'd killed monsters. The two most important monsters - to them, to all of monster kind. To…
"...Chara?"
Asriel.
"...stay away from me," they whispered, turning with a wave of their hand. Ice covered the floor, rose into a wall to prevent their adopted brother from coming closer. "Stay… stay away! No matter what I say, stay away from me!"
Faint from the other side were the questions, the oblivious questions, that did not yet realize their parents were dead. They tried to stand only to collapse back onto their knees, gasping at the pain in their chest. They wanted to die, they wanted to die.
They wanted the monsters to die.
The wall lowered, slowly, and they turned to stare at their poor, poor brother as he approached. And then as he stopped. As he stared at the human and the dust. As he asked, "Chara… wh-what did you do…?"
And something about that look in his eye gave them the strength to stand, the strength to stumble into his arms, still wide open for them despite the evidence of their deed. And they whispered, holding him as tight as they could manage, "No matter what I say or do, stay away from me."
Without warning the young prince was pushed aside, and before he even realized it he was trapped in the room, the door blocked off by ice.
It would be hours before the wall lowered, though nobody was there.
Hours before he realized, nobody was there.
A day before he, in tears, walked all the way to the ruins.
And there he found the human.