*(This is Chapter One of a larger story. If you enjoy it, here’s a link to the other chapters:* [*https://archiveofourown.org/works/43075755/chapters/108244479*](https://archiveofourown.org/works/43075755/chapters/108244479)*)*
# Day One
The sun was just starting to set on Shadow Mountain Monastery, casting the final rays of its pale gold light across the secluded valley. The past few weeks had been difficult for the sisters there. The head priest, a devout older man named Father Peters, had recently passed away, and unfortunately it would be several weeks or even months before a replacement could be sent out to take over the secluded convent. Ever since he’d passed away, the stone halls of the monastery had felt a little… different. A subtle shift in the atmosphere, a weakening of the faith. It represented just a thin crack in their holy defenses, but that was all that was needed for the succubus to finally begin the next step of her plan.
She’d been here for weeks already, relying on her shapeshifting abilities to assume the form of one of the sisters there. Hiding in plain sight, as it were. She needed to be close to the women here in order to corrupt them, and she’d needed the priest to be gone before truly began to exert her influence. And now, at long last, everything was proceeding as she’d planned. One of the sisters she had been keeping a close eye on was Sister Valerie. She was the most promising of the sisters. Not necessarily the one most prone to sin, or the one who would be the easiest to crack, no. Valerie was, however, the one with the most sheer potential. The succubus knew that the next few days were crucial. She needed Valerie to begin her first steps soon, to forsake her holy vows and truly embrace her lust.
The succubus walked quickly through the stone passageways. Shadow Mountain Monastery itself was a vast sprawling complex. Connected to the chapel was a network of hallways and rooms. There were four floors, as well as a belltower, though these days a great many of the rooms sat empty and abandoned. There simply weren’t enough sisters to fully staff the monastery, only twenty or so. A small village was located about four miles to the south of the monastery, and they sometimes sent shipments of supplies for the sisters, but otherwise kept to themselves.
Dinner had just concluded, and between now and the end of the day, the sisters were encouraged to choose an activity that would help them feel closer to the gods. Some chose prayer, or reading from the sacred texts. The succubus wanted Valerie to choose something slightly more orthodox. She stepped up to a locked door and, checking to make sure the coast was clear, unlocked the door and stepped inside, locking the door behind her. She let out a deep breath, and glanced around the room. Dark sigils were scrawled in blood on the floor, arrayed in a precise ring. Black candles flickered to life, their wicks burning with a cold white flame. The succubus finally let her illusion fall, the one that made her appear as a devout nun, a plain one that no one would pay attention to. Part of the illusion was an effect that caused all who looked upon her to quickly forget her. In the past few weeks, no one had even commented on her. In their minds, she was supernaturally forgettable. Just as she intended.
The illusion now dropped, the succubus now appeared quite differently. She had crimson skin and glowing orange eyes. Long luscious lashes and full lips. She had black hair, and spiraling obsidian horns that marked her as a full Lady Succubi of the Courts of Hell. The succubus began to disrobe, revealing her body. Voluptuous breasts, heavy and perfectly shaped as if by a sculptor. Their tips were a dark red, nearly black, and in a perpetual state of stiff arousal. She began to idly play with one of them, twirling it between two fingers, lighting pinching it. She felt the fires of her magic begin to come to life, like a master blacksmith tending to the fires of his forge. Her tall body, exactly six feet, would make any mortal woman weak with envy. A flat belly that sloped down to her thick cunt, hairless and glistening with desire in the low light. Her long legs were smooth and strong. Her back was lithe and muscular, and a whip thin tail lazily flicked back and forth. Her ass, however, put all the rest of her to shame, as it should. As an anal succubus, it was her claim to fame, so to speak. Muscular, thick, fat, and jiggly in all the right places. And, nestled between her ass cheeks, was her unnaturally tight anus, like a gorgeous flower. It had been too long since she had time to properly pleasure her asshole.
Tonight, she would let herself let loose.
Concentrating, she let her lust magic begin to naturally manifest. The air in the room swiftly grew warm, her skin glistened with a light sheen of sweat. She laid down, bare back against the stone tiles, and slowly, luxuriously, spread her legs apart, further and further, putting herself perfectly on display for, sadly, no one at all. In time. Her asshole, now spread wide open, was ready. And Valerie would soon begin feeling the full effects of the succubus’s magic. She grinned, taking a hold of her tail, and inserted it into her anus…
—
Valerie sat in the library, her eyes scanning through the verses of the old bible in front of her. She saw the lines of words, but she didn’t take even a single one of them in. This bible had belonged to Father Peters. Mother Superior Catherine had decided it should go to her, as she felt Valerie would appreciate it best. But right now, Valerie wasn’t actually reading, and was only pretending to. She was going through the motions, for any who watched her, but internally she had her mind on something far more perverse. While she stared at the holy words on the page, she daydreamed of fucking a stranger in the ass. It was sheer, utter blasphemy, but truth be told, it was actually nothing new. Valerie had been suffering from these daydreams for weeks now.
It had all started about a month ago. She’d first thought of them as nightmares. Dreams where she, and everyone else, were all perfectly nude. That would be bad enough, but it didn’t end there. In her dreams, she dreamt of vast orgies. Dozens are first, and eventually hundreds. She saw herself among them, and her fellow sisters of the cloth as well. Each and every single one of them had an outrageously large cock buried in their asshole, pumping away. And each and every single one of them was smiling, moaning even. It had been so horrible, she’d thought at the time. There had been no escape. From the moment Valerie fell asleep, right up until the crow of the rooster at dawn, it was all she dreamt of. Unending, sinful, wretched anal sex.
But as the weeks went on, Valerie found herself guiltily looking forward to going to sleep. The waking world began to feel unreal, and her dreams became a refuge, the only place where she could freely admit that she was beginning to enjoy herself. It was fun to watch her sisters take it up the ass, all while she sat to the side and took it all in.
A few days after she finally began to enjoy the dreams, she began to participate. She knew, deep down, that she was becoming a slut, a filthy whore, not fit to wear the holy robes. But she couldn’t help herself. In her dreams, it felt so damned good. She didn’t care about vows, or chastity, or any of it. She just wanted to feel a cock sliding in and out of her ass, fast and hard, to finally know what it felt like. So, she’d thrown herself into the fray. All those faceless men in her dreams had used her, and in so many imaginative positions that Valerie was shocked her subconscious mind had even been able to come up with them, all the while never knowing that she was being subjected to powerful demonic magic. Being reprogrammed.
And, only recently, she’d stepped things up. In the world of dreams, anything was possible. With a mere thought, you could transform any aspect of the dream to be more… desirable. And so, with hardly any effort, Valerie had imagined herself with one of those grotesquely huge cocks. Nearly a foot long, and constantly dripping with slick precum. Valerie, being the eager slutty bitch that she was, had begun to ass fuck everyone in the dream. Women, men, even her fellow sisters. The Mother Superior even, who had been positively begging for Valerie to fuck her ass-cunt. Valerie had smiled and done her best to please. Those words had stuck with her. Ass-cunt. The real Catherine wouldn’t have ever uttered such a crude phrase, but Valerie didn’t care. In her dreams, Valerie was God.
In the end, it was all just harmless fun. It was just a dream. None of it was real. And, Valerie told herself, it was just a phase. It would probably even pass in time. There was no harm in any of it, she told herself. It was so easy to justify. One day at a time, she’d gone from being one of the most devout nuns in hundreds of miles, to being… this. A slut. Obsessed with assholes. Like a frog in boiling water, she didn’t even realize the full scope of her corruption. She hadn’t prayed in weeks. Hadn’t read the bible, not a single verse, despite the good book being laid open in front of her. It was just an excuse to “study” without being bothered. She hadn’t gone to confession, and she was slowly starting to wonder why she went along with this whole song and dance. Despite all these infractions, she still hadn’t ever defiled her body while awake. She never masturbated. It was as if some part of her was still resisting, though Valerie was nowhere near self aware enough to realize it.
Even now, wide awake and in public, she was daydreaming of it all again. She could still hear the screams of pleasure from the Mother Superior as she’d been pumping away in her ass, filling her with load after load after load. Valerie bit her lip, remembering how fucking good it had been, how delicious the head nun had looked with her ass split in half by that glorious dick. She felt her cock grow hard . Only… no. No, that wasn’t right. She didn’t have a cock, anymore, not now, not while awake. Her smirk quickly became a frown. That moment of bodily dysphoria somehow reached deep inside her and made her feel suddenly aware of the peculiarity of her situation. Perhaps she was getting too invested in this fictional reality? Glancing down at the Bible, she realized she’d been staring at the same page for well over ten minutes now. The words were fuzzy, and almost seemed to be shifting around, defying to be read. She squinted to try and make out what verse it was. The succubus tried to reassert her hold on Valerie, but in that moment, Valerie broke free. A tiny victory that would cascade. It took a solid effort to finally make the words coalesce into something she could decipher.
She saw the words of Ephesians, chapter five, verse three.
“But among you there must not be even a hint of sexual immorality, or of any kind of impurity, or of greed, because these are improper for God’s holy people.”
And, as she read those dreadful words, she felt herself grow absolutely mortified . She felt as if she’d been struck by lightning, by the hand of God Himself. An awareness she had been lacking suddenly swept over her. She had been fantasizing about having sex with her fellow sisters! She’d imagined herself with a fucking cock! She stood up abruptly, pushing her chair back, suddenly unable to sit still. The chair fell backward with a loud clatter on the stone tiles. She was disgusted with herself. She thought back over the past few weeks, and saw how, bit by bit, she’d slowly grown corrupt. One tiny little justification at a time. A slow moral death by a thousand cuts. She was hyperventilating. How come she hadn’t seen it? There had been so many signs, so many red flags! Something was horribly wrong. Satan himself was trying to influence her, to pull her down and bring her low. It was the only explanation…
She glanced around the library. Three other nuns were in here with her, Sisters Ravena and Georgia, studying together, and Sister Marian. All three of them were staring at her. Not in horror, as Valerie had irrationally feared, but just simple confusion. “Sister Valerie? Are you okay?” Sister Ravena asked, concern and love in her voice. Valerie blinked, unable to even speak a reply. She closed her eyes and tried to find her center. She couldn’t remain here. She couldn’t stand to be among them. They were so pure. She was nothing but a dirty little slut . Her face felt hot, and she couldn’t think straight with all those eyes on her. She grabbed the old Bible, and quickly turned and fled from the room. They called after her, but no one followed.
As she walked, Valerie made up her mind. She needed help. She needed the mercy of Heaven. She would go to the Mother Superior and confess everything, tonight. She’d return the Bible as well. She was not worthy of it. She would not let herself continue on this wretched path. She no longer knew her own heart. All this and more went through her mind, and she continued to silently berate herself. How had it all come to this? She was openly crying as she turned the corner to climb the stairs.
But then, somewhere in the stairwell leading between the library and the office of the Mother Superior, she blacked out. She had no memory of what occurred in those few minutes of darkness.
When she finally came to, she found herself having arrived back at the door to her room. The old bible was missing, she dimly realized, but she didn’t care overly much at the moment. Her thoughts were no longer of repentance or piety. Instead, she realized she knew exactly what she had to do. A calm certainty had replaced her panic from only a few minutes before. She didn’t question it. Couldn’t question it, not with the sudden flood of demonic magic that had overwritten parts of her mind, switching off her so-called morality. And now, free from the guilt that had nearly overwhelmed her before, she felt free. Free to do what she should have done weeks ago.
She went inside her room and locked the door behind her, and immediately began to take off her robes, throwing them uncaringly to the side in a pile. Her eyes were glazed over, and all she knew was that her own ass-cunt was greedy . She’d never actually touched herself there, despite the weeks of lewd dreams. That had been a mistake, she knew now. She’d kept her sins within her dreams only. She smirked, now naked aside from her hood and headwrap. She loved being naked like this. And now, it was time. She climbed onto her bed, laying on her back, legs up in the air and spread far apart, exactly the same position the succubus was in only a few rooms away. She couldn’t wait to fucking plunge her fingers deep inside herself. Her breathing was fast, and her heart was hammering away. She wanted this. Needed it. It was time to break her vows in the real world, not just in dreams.
She reached down and began to insert a single finger up her asshole. No lube, no spit. But it felt right. It was a bit painful without anything to act as lube, but Valerie only smiled. She found herself actually rather liking the pain. She was so absorbed in it, relishing that sweet pain, and the dry tightness of her favorite hole, that she didn’t hear the click of the lock on the door.
Unfortunately, in her altered state of mind, she hadn’t considered the fact that she shared a room with one of the other nuns, Sister Emily. And, even if she had remembered, Valerie wouldn’t have stopped. Somewhere, deep in her soul, she wanted to be seen. She wanted someone to see her asshole like this, cheeks spread apart, on full display, with her fingers disappearing within. She was losing her anal virginity in a magically induced haze, and she literally couldn’t stop herself. Emily, not knowing the sinful scene that awaited her, opened the door and stepped inside.
The succubus, in the nearby room, realized her mistake quickly. But it was only a minor setback, and one that was easily remedied. As Emily turned to look at her roommates side of the room, the succubus placed a veil over Valerie hiding her from sight and from hearing. All Emily saw was an abandoned bed. She frowned. She’d been so sure she’d heard Valerie in here. Odd. Her eyes passed right over her naked sister, unseeing, uncaring. Valerie, fully hidden from view, froze in place, embarrassed. She wanted to just keep going, to anally masturbate without a care. Then, Emily turned away, and Valerie frowned, a finger still buried in her ass.
“It’s okay, dear sister. Keep going, she can’t see you. Keep going.”
Valerie blinked in surprise, eyes wide. She’d heard those words directly in her mind. A red flag if ever there was one. But Valerie didn’t fucking care, not in this moment, this beautiful moment where she was finally losing her anal virginity. In fact, she smiled. Encouragement and support was rather nice, actually. And that voice had such a nice ring to it. The words echoed in her mind, and she picked up the pace.
She started to work a second finger inside. Valerie giggled. She felt like such a Goddamn slut, and this time it didn’t feel like such a bad thing. Not an insult, but a title , and one she wore proudly. She was a slutty bitch, a whore for anal. This was how the human body was meant to be used, how the ass was meant to be enjoyed. Why feel shame? Why hide it away? Silly “holy” superstitions, that’s all it was. She didn’t know how it was possible for Emily to ignore her like this, all she knew was she was getting away with sinning openly, in plain sight. She loved it. If only Emily knew the sight she was missing out on.
All the succubus had done was turn off Valerie’s sense of morality. These desires had all been there, right there at the forefront of her mind, buried barely surface deep. This was only a temporary change, and it was harmful to the human psyche to do too often, but tonight, this tiny bit of demon magic was helping Valerie admit to herself what she truly wanted.
And after tonight, Valerie wouldn’t be able to go back. Once the succubus stopped the ritual, Valerie would return to her senses. But the succubus intended to make sure Valerie couldn’t go back.
A few minutes later, Valerie felt herself growing close to orgasm. Her first anal-only orgasm. Across the room, Emily was brushing her hair and softly humming a hymn. Valerie glanced at her, and suddenly wanted to feel Emily’s tongue against her stretched out anus. Such a perverse idea, but one she immediately loved. She desperately wished to feel it. And the succubus, eager to help Valerie become fully corrupt, wanted to please. A few minutes later, Emily laid down and quickly fell asleep. The succubus had been waiting for this, and moments after Emily drifted to sleep, the succubus reached into Emily’s relaxed mind and assumed control. It was easy, like slipping on a pair of comfortable shoes. Emily, in a sleep walking daze, rose from her bed, wearing her nightgown, and marched over to Valerie’s side of the room. She was unable to resist, and in the morning she wouldn’t even remember anything beyond the oddly intimate dreams she’d had of Valerie. Valerie gasped in delight as Emily knelt at the edge of her bed, and stuck out her tongue, patiently waiting. Her eyes were a pure, rich red, though they were only half open. Valerie noticed the change, but couldn’t be bothered to care just then. If anything, she thought the change in eye color suited the young, somewhat boring girl.
She needed release, and she needed it now. Valerie removed her fingers from her anus and got up, turning around and pushing her ass into Emily’s waiting face. The sleeping nuns’ extended tongue slid straight into Valerie’s relaxed, stretched out ass. Valerie, not expecting it to feel as good as it did, began to orgasm immediately . And, in a burst of demonic magic, the succubus let her spell begin to take effect, powered by the magic inherent in the orgasm itself.
Valerie began to grow a cock. The succubus grinned. Valerie wouldn’t be able to “repent” after this. Valerie screamed as she felt her forgotten cunt smooth over in only a few seconds. It was painful , but Valerie was feeling equal parts pain and pleasure. Her ignored pussy was gone before she could even react. Seconds later, her smooth crotch began to bulge, and three parts began to form. Two absurdly large balls began to descend, dropping lower and lower. Her penis started out small and flaccid, then began to elongate and grow firm. Once fully formed, and fully erect, the cock was very nearly a full foot in length. Her balls hung low, hairless and smooth and heavy with cum, almost the size of an orange. Valerie was gasping, trying to catch her breath. She looked down at herself. Her tits seemed larger as well. Her eyes went wide when she took in how fucking huge her newly gained cock was. Emily tongue was still gently pushing in and out of her. And now, Valerie wanted to put this cock to use.
She stood up, giving Emily a dark look… and then promptly passed out, falling sideways directly on to her bed. Emily obediently rose to her feet, and walked back to her own bed.
—
A few rooms away, the succubus collapsed in exhaustion. Creating an actual transformation on that level had been hellishly difficult. Illusion magic was easy, manipulating minds was tricky, but manageable. Permanent alterations, though, those took serious power and skill. And the succubus had spent every ounce of her power in the name of transforming Valerie, giving her an obscenely thick cock.
Source: reddit.com/r/eroticliterature/comments/yv89cs/in_the_shadow_of_the_monastery_f26_ffuta_nuns