A deal with a demon (minor Beastman TF)

>the young woman double checks every glyph, every symbol painted onto the stone floor
>the castle is quite abandoned, but she still looks over her shoulder, scared of being seen
>if her parents caught her doing this, they'd kill her
>and that might not be an exaggeration, she would probably be accused of witchcraft
>she pauses for a moment
>if this works, she might actually earn that title
>she'd dabbled with a few spells, but this will be the first serious one she's ever done
>breathing deeply, she raises her finger and pricks the skin with a needle
>a few drops of blood fall onto the pentagram in the center of the room
>the walls light up with an eerie glow
>she suddenly feels she's not alone
>she was expecting more of a flash or some lightning
>but no, the figure in the geometric center of the spell-circle is just... there
“Who has summoned me...?”
>the voice is deep, and not altogether human sounding
>she steps forward and introduces herself
> “I am Amelin, daughter of Thomas, of the Breken farmsteads”
>the demon pauses, confused
“Wh... what?  A farmer's daughter?  SUMMONER, do not mock me, reveal yourself.”
>the girl stammers, but stands her ground
> “I assure you I am the summoner, and you will do as I ask, for I have bound you!”
>the demon signs, then extends himself outwards
>he fully intends to crush this puny girl for wasting his time
>to his astonishment, the barrier around the circle holds firm
>the girl may have humble origins, but she has the potential to be a true sorceress one day
>or she was tremendously lucky in picking the right combination of glyphs
>sighing again, the demon nods
“What do you wish of me.”
>the girl bites her lip, she's... embarrassed all of a sudden?
> “You're demon of lust, correct?”
“Among other things, including violence and destruction, yes my powers focus on lust and corruption through temptation.”
> “I... would like you to transform me just enough so that I can take a minotaur's cock.”
“...”
>seeing the demon's lack of reaction, she rolls her eyes and fetches something from her bag
>she holds up a book to him, The Maiden and the Minotaur
> “I've read this book so many times!  It's so romantic, and deviant... their love forbidden by societal norms, but they come together anyway.  In the end she becomes a beautiful centauress, and she's able to love the minotaur fully.  And you see I...”
“Stop, stop, stop.  I am a demon lord of the 3rd realm.  I care not for your childish fantasies.  They are beneath me.  Release me now and I may spare you still.”
>Amelin lets out her own sigh
> “Alright... if you won't help me I guess I'll have to find another demon. One not as bound up in his own pride.  I'll go.”
>she turns to leave, then stops
> “Oh, don't worry.  I'm sure the glyphs will eventually wash away.  You should be free in... 10, maybe 20 years.
>the demon's eyes go wide, and he visible shrinks in fear at the very notion
>she's right
>if they're deep enough in the castle it could take decades for the circle to decay enough for him to break free
>to be gone that long... the other demons would raid his realm and leave him with nothing
“Alright... I can do what you ask”
>he raises his clawed hand but she calls for him to stop
> “Wait, wait, a few ground rules.  I need to still appear human.  My parents would kill me if I came home with a tail or horns or whatever.  I want a stable transformation, not one that will slowly consume my body and turn me into a pile of gnarled limbs.  And maybe... add a pheromone.  Something to help entice minotaurs.  And centaurs!”
>the demon raises an eye brow
>she just shrugs
> “I want to keep my options open.”
“You'll need to drop the circle for me to put my magic on you.”
>she raises her hand to her mouth in mock outrage
> “And still you try and trick me... you're a sly one you are.  I've set the circle so you cannot physically leave it, nor can you affect my mind.  But transmogrification spells will get through.  So... you can turn me into a toad, if you want.  But that won't help you out of being trapped.”
>she giggles as she hears the demon actually gnashing it's teeth in frustration
“Child, you need to understand, what you ask is a very specific manipulation of magic.  It would cost me significant magical energies.  Normally I could replenish my reserves by taking the soul-energy of beings sacrificed to me.  But you bring no sacrifices, you allow no true corruption.  You tie my hands.”
>she pauses, considering the problem
> “Can lust demons not feed on the desires of those bound to them.  Or... those to whom they are bound in your case.”
“Yes, but it's not as potent as raw souls.  You would need to create a cult with dozens of members engaging in lust for me to fully recharge.”
> Amelin lights up at this
> “A cult... the problem is, most of my neighbours don't share my... sexual fervour.”
“That would be easy to fix, I could give you seeds of corruption to plant in your neighbours.  Their twisted desires would grow over time, guided by your own, until they wouldn't be able to resist joining your cult.  But that won't happen, because your stupid human morals will prevent you from corrupting your friends like that.”
> “No, no, that sounds super hot!  Can we give them changes like you'll give me?  I'd love to see that stuck up bitch Mavis prostrate herself before a goatman, and then watch her take it's huge beast shaft.”
>event through the barrier, the demon can sense the growing arousal in the girl before him
>she wasn't kidding, she gets off on this stuff
>what were they teaching these human kids to lead them to such depravity?
“So... you accept these terms?”
> “Well... how long would it take for these “seeds” to take root?”
“Maybe a month.”
> “So... I keep you chained up here until then, make the place a bit more cozy for you.  Then when the changes start in the others, we start our orgies.  You recuperate, and I release you back to your own realm.”
>the creature huffs and paces slowly in the confined space, judging it
“I have had worse contracts.  I accept.”
>she nods, then goes stiff as she feels a tingle run through her
>the spike of horniness she felt earlier at imagining humiliating her rivals has returned
>but this isn't her usual arousal
“Relinquish your humanity unto me.  Give it up, in exchange for these sinful pleasures I now bestow upon you.”
>it's like a fire burning her
>but instead of pain, pleasure courses through her flesh
>she's stripped off her gown without realizing it
>her fingers cup her firm breasts
>not as big as Mavis... but she likes them well enough
>she gasps as she feels the tingling center on her nipples
>they're changing
>she wants to look down and examine them, but her head is spinning
>she can't summon the willpower to even do that
>but she feels them grow longer
>her fingers feel the skin turn rougher, more leathery, but still delightfully sensitive
>she's gaining animal teats
>a cry of pleasure surges from her as the changes move to her sex
>this is it, the important part
>she's been carving and polishing a great big wooden phallus at home
>diligently hidden from her family, of course
>it's an approximation of what she thinks the minotaur's shaft looks like
>she can't wait to try it out
>see just how deep it can reach inside of her new cunt
>her fingers test her lips
>gods, she's wet down there
>she finally regains enough control to open her eyes and look down
>the changes are happening fast
>her sex is puffy and swollen
>the labia are dark brown, same as her new nipples
>they're a stark contrast to the rest of her skin, which is still it's normal milky complexion
>she slips three fingers into herself easily
>clenching her muscles reveals just how tight she can make it
>whatever male she ends up with is going to have the time of his life, getting his pole gripped and polished
>she's panting now
>this is too much, it's like a dream
>she pushes a fourth finger in
>then her whole hand
>she's actually done it
>roaming fingers find her clit
>heavens!  It's grown large and stiff
>she stimulates something deep within herself in such a perfect way that her knees give out
>she curls up onto the stone floor, ignoring it's roughness
>she's humping her hand furiously now
>just a mare looking for a stud to fuck her
>images of beastly lovers roam through her mind
>licking them, stroking them, taking them deep into her pussy
>then the visions shift to her village
>her school friends and neighbors
>she sees her friend Emma trying to sate the need burning in her new canine sex
>unable to scratch the itch, she ends up on all fours, presenting herself to a common dog
>not even a beastman, she's content to just fuck an animal
>even Amelin's own sister hasn't been spared
>she's sporting an equine sex like her own
>in the dream, Amelin doesn't even hesitate
>she embraces her perturbed sister, shows her how to cool her unbearable heat
>with her fingers, and her tongue, to start
>but soon... they'll all find strong males to satiate these sinful desires
>she feels what must be the third orgasm in a row blast through her
>pulling her wet hand up to her face, she licks it without thinking
> “That was so... messed up.  Gods, I love it.”
>she needs time to recover
>and to bask in the aftershock of such delightful pleasure
>if just touching herself felt that good, what will it be like when she actually has sex?
>all the while, the demon just watches her, like a cat eyeing a mouse
>but he's safe and sound, for now
>finally able to stand once more, she pulls her skirts up
>but they catch on something at her lower back
>a flowing, horse tail hangs at the base of her spine
> “Wha... demon!  I told you I want to remain outwardly human!  What the hell is this?”
>the creature shrugs and smiles a smile full of pointed teeth
“You can hide it easily enough beneath those giant robes of yours.  And if you abstain from sex it will recede. Eventually.  Besides... isn't a little risk worth the thrill of being marked by your newfound beastly nature?  Just think of how good it will feel when your mate yanks on it while he's fucking you from beind.”
>she shudders, the visions threatening to return and overwhelm her
> “Alright, stop.  I get it.  But no more tricks!”
>she packs up her things, and promises to return soon
>before leaving she turns to him
>she's about to ask his name, but knows that would grant her even more power over him
>she doesn't want to push her luck just yet
> “I... look forward to doing business with you.”