Where the Bad Guys Always Win

Slithering Corruption

Byleth grimaced as she faced off with the strange old man before her. She had become a professor at Garreg Mach and had formed deep relationships with several of the students there, including those such as Edelgard, Petra, Dorothea, and Flayn, among others. However, after witnessing an assassination attempt, Byleth began investigating an invasion force led by the Flame Emperor, known as Those who slither in the dark. Before she could get all of the information, the Flame Emperor invaded, and in the battle, Byleth came across an old man who knew who she was.

Calling himself Thales, he told Byleth that they would rise to rule over this world, while animals like her would serve as livestock. Gritting her teeth, Byleth attacked, but Thales was ready, with several darkness spells pushing  her back. The young professor was soon overwhelmed, especially when the Flame Emperor appeared and joined in on the assault. Thales began chanting a spell as Byleth and the Flame Emperor fought, and the green-haired woman was able to eventually knock the warlord's helmet off, revealing herself to be Edelgard!

Stunned by her friend's betrayal, Byleth was frozen, forgetting about Thales. That allowed him to finish his spell. Magical runes appeared beneath Byleth and soon magic tendrils of darkness enveloped the young woman. She screamed as her body was wrapped by the tentacles, a welcome warmth strangely radiating from her body. Edelgard stood there, stunned, wondering what was going on.

Inside Byleth's head, the woman herself was suddenly face to face with Sothis, a Goddess in the form of a young girl that was sealed inside her body. She started yelling at Byleth for being so stupid and inattentive, reaming her for getting caught, when suddenly the darkness bust in on their mind room. Both Byleth and Sothis tried to fight off the darkness, but it was simply too strong and bound their limbs, raising them off the ground spread eagle as further tentacles snaked along their bodies.

Panic began to set in as Byleth and Sothis found themselves helpless. The darkness tendrils slithered underneath their clothes and ripped them off, leaving both girls naked. Immediately, some of the tendrils formed large cups and placed themselves over Byleth's large tits, and while Sothis was flatter, her own breasts got suction cups as well. The teacher screamed as her breasts were pumped. While shame filled her body, what worried her more was that arousal also rose up within her. She screamed again, but another tendril wormed its way inside her mouth, gagging her.

While Byleth gagged on the tentacle in  her mouth, two more slithered their way up her thick thighs and jammed themselves inside her pussy and asshole. Byleth screamed as she was violated, helpless to stop it. The darkness wormed its way into her, stretching her in just the best way, and the woman found herself moaning as arousal replaced the pain in her body. She felt the darkness trying to overwhelm her, trying to get her to give up and surrender, and while she hated being tentacle raped, the darkness had done so in a way that seemed very pleasurable, so even as Byleth tried to fight, she could feel herself slipping away by the second.

Sothis was faring no better. She was being assaulted by the tentacles as well. She had no idea how the darkness was this powerful, as she should have been able to easily overcome this spell, but found herself completely powerless. A voice that sounded like her asked her if being helpless was all that bad, punctuating it by forcing Sothis to cum. As someone who wasn't used to physical contact with humans, Sothis had never really experienced sexual pleasure, and the darkness took advantage, probing her body in such a way to inflame her budding pleasure until she came several times in a row.

Both Byleth and Sothis squealed in their bonds as they were raped by the darkness tentacles, their bodies overwhelmed by pleasure. Little by little, the darkness began to grow bigger, and both Byleth and Sothis began to struggle less and less. Before long, neither woman put up a fight as the darkness filled the room, covering both ladies and absorbing their very souls. Byleth had one last spark of herself watch helplessly as her body was corrupted. A single tear shed from her eye as she came again, her soul fully consumed by the darkness.

Back in reality, Edelgard was confused to what was happening and confronted Thales. He told her it was necessary in order to achieve his goals, and that as a mere weapon, she should follow orders and keep her trap shut. Fed up with Thales' racism, Edelgard gritted her teeth and decided she couldn't keep up appearances anymore and follow her creator's intentions any longer. Reaching over, she pulled out her ax and assumed a battle stance, ready and willing to kill Thales right then and there.

Before she could swing, however, Edelgard felt a hand grip her wrist, and she turned around to see Byleth. The green-haired woman normally had a blank stare much of the time, but now her eyes were swirling with darkness as black energy radiated out of her. Stunned, Edelgard let down her guard, leaving her helpless as Byleth stared deep into her eyes. Suddenly, the white-haired woman found herself heavily aroused and felt her soul being sealed away. In mere seconds, her eyes went blank and she stood upright, dropping her ax.

Walking up to the two ladies, Thales laughed as his plan succeeded. Though he knew Edelgard wasn't listening, he explained that his spell infected his pure darkness into Byleth, corrupting the woman and the terrible soul within, so that she was an extension of himself. And with his darkness enhancing her abilities, it gave her the ability to brainwash anyone not of Those who slither in the dark just by making eye contact.

Thales ordered Edelgard and Byleth to strip naked, pleased when both women obeyed without hesitation. He fondled Byleth's massive chest, licking her soft skin and enjoying the taste. Then, he decided to move to Edelgard and groped her boobs, pleased to see her not protesting even a little. Thales chuckled, telling Edelgard that she should have just kept her mouth shut like a good object, but since she considers herself one of them, she can share their fate. He then removed his robe and order both women to lick his erect cock. Immediately, the two ladies got on their knees and began to lovingly worship the rod of their new owner, much to Thales' delight.

With Byleth's new power, the battle quickly turned in the favor of Those who slither in the dark. She was able to make contact with most of the monastery, brainwashing the soldiers left and right. The other heads, Dimitri and Claude, saw what was happening and tried to escape, but were soon surrounded by their own corrupted forces and were captured, where they were brainwashed as well. All of the students fell into the darkness, surrendering to their enemies without a fight. Soon, all that was left was Rhea, the head of the Church of Seiros. Though she was extremely powerful and functionally immortal, not even she could stand against Byleth's power, and in minutes she was on her knees, bowing before Byleth and Thales.

The next morning, Thales grinned as he walked out on the courtyard. They had taken over the monastery and were using it as their foothold for taking over the rest of the continent, and while his troops began the invasion, he had Byleth handle the captured students. Byleth stood emotionless as she welcomed her Master to the courtyard, then ordered those in front of her to properly greet their lord and master, the man superior to them all.

Several dozen women, including Ingrid, Dorothea, Mercedes, Edelgard, Petra, Flayn, Rhea, and Cassandra, stood in the courtyard, completely hypnotized. Aside from stockings, arm-length gloves, and their student collars, the women were completely naked. The girls then raised their right arms and saluted their superior all in unison. Thales smiled as he idly fondled Byleth's boobs. He asked the hypnotized women who they were, and they all shouted that they were animals who deserved to be slaves. There wasn't a single hint of rebellion in any of their voices.

Looking over, Thales saw Rhea and grinned. He walked over to the pompous Goddess and ordered her to bow before him. She obeyed instantly, even asking if he wanted her to kiss his shoes. He chuckled and stomped on her head, grinding his foot into her head. Gloating about how she had opposed them for centuries, and now he had the last laugh. Wanting to humiliate her soul even more, he ordered her to apologize for all her sins against them, and between grunts from being pushed into the ground, Rhea apologized multiple times, begging Thales for mercy.

Oh yes, Thales was going to enjoy his victory very much.

Many years later, Byleth stared out in the distance as she gripped the bar in front of her. She was on all fours, wearing nothing but a collar with a bell on it. Her former students were around her, with Edelgard and Dorothea on either side, also naked except for a collar. None of the girls talked to each other, their minds completely blank, barely even registering that there was anyone next to them. Once Fodlan had been conquered and its people enslaved, Byleth had no more use, and was thus sent to be livestock with the others. The only one of her group not to be there was Rhea, who was taken by Thales to be abused and humiliated in public as revenge.

But Byleth didn't much care about that. Her only concern was when the guards came by. They dumped some kind of manufactured slop in the pail in front of her, and a grateful Byleth smiled and started eating the meal. She then moaned as her breasts became inflamed. The guards then attached the suction cups to her breasts, and soon Byleth was lactating, along with the other girls in the building. Once the guards were done feeding the women, one of them decided to fuck the helpless Byleth. When she felt his cock push into her wet pussy, Byleth cried out in pleasure. She idly wondered if she would get pregnant again. As the guard fucked her and the suction cups emptied her breasts, Byleth looked outward at the hundreds of other cows also lined up.

They used to be the women of Fodlan, but in this new world, they were nothing but animals.

Thanks to Byleth, they had lost their humanity.

But as she cried out in pleasure as another orgasm ripped through her, Byleth had no regrets.