Reincarnated in a depressing erotic world but living a normal life (right?)

In a world once vibrant and full of hopes where infinite possibilities reigned, now only a chilling and desolate silence prevailed, in which nothing moved. Everything, from the water flowing in rivers to the clouds floating in the sky, remained frozen and immobile, stopped in a perpetual position. Even people had stopped in positions one might find in their daily lives, frozen as if they were static statues in a museum.

"......."

In such a world, there was only a hooded figure moving, walking, observing the usual landscape it had seen hundreds, no, thousands, or perhaps even millions of times since arriving in this world.

Beneath the figure's cloak, the slender outline of a feminine body could be seen, showing glimpses of its pale, ashen-white skin as it continued its walk in this last stroll through this world.

"....."

At that moment, the figure momentarily stopped to look at the unchangeable blue sky, remembering that it was always clear, while recalling the agony it had faced to get to where it was. "She" was originally an inhabitant of another world who had suffered a paranormal experience in which her life was toyed with and irreversibly deformed without any justification by the whims of an existence that was beyond what her old common sense dictated, which drove the humans it trapped insane to satisfy its cruel desires. That included "her," who was also a victim of its twisted game, but there was something that differentiated "her" from the other victims trapped in the same situation, and that was her strong will.

Despite "she" having been one of the first victims to be captured and cruelly played with for entertainment, she still maintained her firm will, being able to preserve much of her sanity even as she slowly began to be alone, seeing how everyone she knew fell into madness or became simple ego-less puppets controlled by someone else. Furthermore, as time passed, "she" was aware that, like the others, she was also starting to go mad, losing important things to her and feeling her own existence slowly being repainted by someone else. It was at that point that "she" could only ask herself: How much more can I endure?

In the end, even with all her efforts, deep down she knew that sooner or later she would go insane, leading her to frustration about her situation. But one day, while suffering an attack due to her growing irritation with her situation, she met a "boy" with a somewhat feminine appearance, silver hair, and mysterious white eyes sleeping on the ground, whom she ended up attacking in search of solace.

In the end, she began to live with the "boy," and so there were weeks in which she was not manipulated or made to play any degrading role while spending time with him. "She" felt at peace being accepted by someone who preserved the sanity that she herself had partly lost and who accepted her even seeing what she had become without showing any pity or disdain in their eyes. That was the best and most invaluable moment for "her," one she still cherishes to this day.

However, just as suddenly as he appeared before her, the "boy" also disappeared while saying words as if talking to someone, as if they were about to separate. This terrified her to the point of ignoring how the space that had held her captive and caused so much suffering for so long was slowly crumbling around her, and she tried to reach the "boy" before he vanished...

"......"

But in the end, "she" failed, remembering how her hand was unable to reach him in time before everything went dark, only to wake up alone in a mysterious facility.

At the facility, she spoke with people who explained her current situation while presenting her with two options:

The first was to work for them as a valuable modified human, thanks to constant exposure to an unknown energy source that made her stronger and more capable than a normal human, or the second was to erase her memories to receive support to rebuild her life.

Faced with these two paths, there was only one option that would allow "her" to find that mysterious "boy" again, whom she now believed to be some kind of anomalous entity.

.... In that way, she began to work, entering a place known as the "Veil," where she carried out reconnaissance missions while simultaneously searching for any clue about that "boy."

"She" continued this lifestyle for a few years, chasing every lead she could get, until she finally perceived the scent of that "boy" once again after so much time, but upon reaching the source, what she found was not the "boy" she had been searching for. Instead, she met a disoriented young man who seemed to have no knowledge of what he had gotten himself into, whom she ended up helping to escape after erasing his memories of his current experience.

In this way, time continued to pass while her desperation grew more and more, because when she slept, she had strange visions of the "boy" being constantly violated by other women in front of "her."

Even when she took medication, tried memory erasures, and even tried to convince herself that they were just hallucinations as a form of self-deception, nothing brought her peace.

As time passed, she began to look worse and worse while neglecting her health, enduring those visions that only made her lose more and more sanity as if it were a kind of torture. Her brown hair lost its original color, changing to a gray-white due to stress, and her eyes, which once reflected a strong will, became dark and lifeless as she adopted increasingly self-destructive traits in her desperate search.

But, contrary to what one might think, these attitudes, instead of weakening her, actually strengthened her more and more, despite her constant appearance on the verge of total collapse.

Perhaps at that moment she was already broken?

But her growing self-destructive behaviors led her to recklessness when she made a mistake that ended up causing her to fall into a spatiotemporal rift that sent her to this world.

".... Now that I think about it, that's how it started, isn't it?"

Once "she" arrived, she noticed how everything else, except herself, was frozen in time, leaving her virtually alone in a world where "she" was the only one moving.

Time did not pass, "she" did not age, and nothing changed, with the only source of comfort once again being that "boy" and the memories they shared together, accompanied by those torturous visions that motivated her to find him with increasing urgency.

In the end, "she" tirelessly sought, practiced, and mastered the power known in this world as magic for an amount of time unthinkable for a human, taking advantage of the lack of it. "She" primarily learned the magic that manipulated the only thing that would allow her to escape from this world: "shadows."

"She" perfected shadow magic and infused it with all her obsession and the residues of that energy which she finally discovered belonged to that "boy" to merge her own existence with the shadows themselves. This gave her the powerful ability to create shadows capable of consuming and absorbing like black holes everything "she" desired, which she called "Shadows of Obsession."

".... I don't need this world anymore" 

With those words, "she" expanded the shadow at her feet, merging with it more and more as it swallowed everything in its path, making every thing and living being it trapped disappear until, in the end, nothing remained in that world but darkness.

That was the day when Tanya, the Demon Lord representing Envy, was born and freed from her cage.