Sometimes Mio didn't want to open her eyes, for only in the sweet darkness could she get a respite from the Hell that her existence had become. If she opened her eyes, she would see her jailer again and feel the shackles that held her in an eternal prison.
Her head was touched by a delicate maiden's hand and began to stroke gently. If given the chance, Mio wrapped herself desperately in a pillow. Or better yet, under a thick blanket. At least this time she woke up in a normal apartment. Maybe even their home. She no longer remembered how long ago they had been there.
"...Mio please, don't leave me…" sleepily whispered her tormentor. It had long since been neither a plea nor a request, but just her favorite taunt from her lips. She knew perfectly well that Amakura hated it.
And she knew just as well that Mio would do her mistress's bidding like a beaten dog. And so she grimaced and hugged the sadist back, silently trying to figure out when she had time to wake up. Sometimes the girl tried to get ahead of her tormentor and, no, not to confront her, but to hide as far away as possible. It was a blessing that they didn't always wake up in the normal reality. Sometimes it was a world of technological advances, sometimes a reality of incredible wonders, but more often than not, it was a cursed village where the spirits of the dead had cursed their lives forever.
But no matter how far Mio tried to escape, she found it.
Always.
And there was nothing she could do about it.
Amakura dreamed of cutting her out of her life. She dreamed of avenging every second of suffering she had caused, every life destroyed in the name of her selfish desire. She dreamed of killing her, of squeezing her neck with fingers…
Mio shuddered, as she did every time those thoughts crossed her mind, and the mark on her neck began to burn unpleasantly. The crimson butterfly that stayed with her in each new life like a chain bound the girl with guilt. The guilt that kept Mio from fighting for her happiness.
Was she entitled to it?
No.
After all, she was the one who had started this Hell.
She was sure of it.
So each time, Mio unquestioningly allowed the monster to strip away her friends, family, and life so that Amakura's entire existence would be dedicated to her and only her. Even death couldn't stop the beast for long, because as soon as one of them died, the other would immediately follow the dead one into a new reality.
They didn't know why it worked that way. Although Mio suspected her tormentor, even if it wasn't her, the sadist was fine with it.
At times, Amakura envied the ghosts of the village. Those were forever doomed to repeat those fateful events, but time no longer lived for them. Their nightmare was long over, even if they would never know it. But the girl's nightmare continued even now, and she could not afford such bliss as a miraculous forgetting.
Finally, Mio accepted the inevitable and slowly opened her eyes. Before the girl lay her twin, in whose brown eyes the fires of sick obsession clearly splashed, and Amakura had long since given up hope that those lights belonged to anyone else.
"Didn't we always promise each other… that we would always be together?" asked Mayu happily, knowing exactly what answer her favorite toy would give to her hated yet beloved sister.
Amakura, on cue, put her arm around her sister and said the memorized words that had long ago broken the younger twin, "Mayu, we'll be together…we will."
Mio had long ago given up hope that this nightmare would end.
Their repentance will never end.
Maybe I'll get bored and write a story that doesn't misrepresent the canonical characters by hypertrophizing them to a single trait. Maybe.