Succubus Sister (F/F Incest, some M/F)

*All characters in this short story are 18+*

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Sara had gotten all the sleep one could have while getting her ass eaten like a dog going to town on an empty pudding cup. She screamed the latest of myriad orgasms deep inside her pillow as the tongue stretched inside her to a depth no man could ever reach.

“Good Morning,” her shiny jet-black-haired sister Tegan said after pulling her sticky snake tongue out of the wet rectum. “Did you sleep well?”

“You know every night is just a blur for me,” replied the short-hair human dirty blonde.

“Well, wait ‘til you see what I have in store for you today, then.”

“What time is it?” Sara said. “I don’t want to be late for school; there’s an English quiz 1st period.”

Tegan’s red eyes flared. “Ugh, school. How about I fuck you so hard you forget English altogether.”

“That sounds really nice actually…” Sara replied with the corner smile that drove her sister batty. Tegan’s lust sense was tingling in her horns. The pure white skin of her large breast rubbed up against her sister’s body. Her naturally crimson red lips stole a French kiss when their faces crossed on her way to nestling the smaller blonde girl’s face between the soft milk bags.

A black tail with a rubbery spade extremity pushed through Sara’s wet, quivering pussy. Her new scream-pillow was a pair of milky white breasts and she made good use of them when Tegan unleashed her tail on her like an overclocked telescopic dildo. The flailing tip was tickling all the sweet spots with surgical precision. Smothered in soft flesh, Sara screamed until her face turned red. The sisters missed all of their morning classes that day.

Tegan and Sara were the most unidentical fraternal twins in the world. Other than indie-pop bands, hence their names, their mother had a penchant for playing mythological tinder. After hooking up too close to her genome, she gave birth to Sara, a perfectly healthy, perfectly normal human child. Holding on to Sara’s ankle as she was pulled out into the world was Tegan, a perfectly healthy, perfectly normal… pure succubus.

The two had been uncomfortably close since birth, but now, with their own apartment, evenings and nights were torrid love affairs of near-constant orgasms. To the untrained eye, Tegan might appear to be the dominant one in the relationship but, really, her life had been dedicated to bringing her soulmate pleasure while Sara was just enjoying the amazing ride.

The scope of succubi powers over male minds had been grossly understated by folklore. Any man who even glanced Tegan’s way was consumed by desire for the rest of his life. Male students and teachers from her school were waking up around this time from fevered wet dreams of brushing a finger in her camel toe, putting their hands on her slender, toned waist, and burying their face in the bouncy cushions of her chest or ass. They would then lotion their morning wood to masturbate thinking about her red lips vacuum-sealing their cocks. Thousands of gallons of human ejaculate had found the bottom of underpants and tissues in her name.

Sara was blissfully unaware of the aura of mental destruction around her sister and the hundreds of additional lives she ruined whenever she took the succubus shopping in the city. She assumed everyone stared at her sister because she was hot not because they were sexually traumatized for life.

Tegan did not give a single fuck about anyone else or how she could rule the world if she wanted to. The only reason she even left the bedroom was that Sara’s human mind, as horny as it was, longed for more than just cumming day and night. Sara was the one with ambitions. Dumb white picket fence ambitions… but if that’s what it took to make her sister happy, Tegan would go to *boring* school with her during the day and make up for lost time at night.

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The afternoon class was gym, which was the only class Tegan didn’t mind attending so much. She had pulled a thin white shirt over her bouncy jubblies that threatened to spill out of the worn fabric. That rag was on its last thread. Too short to cover her full rack, too thin to leave anything to the imagination, it beautifully complemented the well-defined abs and cum-gutters of her abdomen. Her gym shorts had a pronounced butt cleavage to work around the tail. It had frayed and ripped over time to expose most of her ass.

Her outfit was completely against school regulation but who was going to stop her? The gym teacher desperately trying to hide his erection? If the class started to turn into a real gym class with lapses and activities, Tegan would use her tail to skip rope and watch all the boys scatter for corners and cover on account of having creamed their pants watching her big juicy tits bounce up and down through the see-through, form-fitting shirt.

“Can I talk to you for a minute?” Sara asked her sister who was doing stretches to derail the dodgeball game.

Seconds later they were in the showers. Tegan was railing her sister from behind. The black tail ran between her long, muscular legs and vulva first so they could share each other’s grool with the make-shift cock’s coming and goings.

The technically older but much smaller sister was pinned against the shower wall, her feet not even touching the wet floor. Sara tried to focus on sucking the fingers hooked in her mouth instead of letting herself scream with delight the way she did in a less public setting. Having accidentally pulled down the faucet lever, water was drenching them both in a wet t-shirt contest that Tegan was clearly winning.

When the quivering of her legs died down and her toes uncurled, Sara was lowered to solid ground but stayed pushed on the shower wall while her legs built the strength to stand on their own.

“I’d say we’ve learned enough at school for one day.” Tegan opened up a swirly pink portal that no doubt led back to the intimacy of their bedroom.

“Wait! I really did want to talk to you…” Sara voiced. “I’ll be home a little later tonight so you should head back without me.”

“Head back without you? What… what is going on?”

“It’s nothing to worry about. I’m just meeting someone after school for a project.”

“Is it on how to get better at lying?” Tegan said.

Sara paused at the accusation but her sister was right. “I don’t want to lose what we have going on. We’ll have our best night ever when I come back.”

“But you want to see other people,” Tegan said, fighting back a scream. “Is that it?”

“I mean… well yeah, eventually. You’re my sister. We’re not… I’m more like a sex toy to you than anything, right? But I’m totally OK with that. I just need you to be OK with me going on a non-incestuous date maybe once in a while.”

Tegan was trying her best to appear cool and collected but, through clenched fists, her demonic anger was amplifying her powers and making her male classmates over the wall gush like fountains without understanding why. “Who?”

“Jade from home ec… I’m going to be upfront with her. If she’s not OK with you being a big part of my life, I’ll dump her ass so fast…”

“You think I want a threesome with that skank?” Tegan interrupted.

“Don’t be like that, please. I want everyone to be happy. Whatever you’re comfortable with, even if it’s something like joint custody, I’m on board. We will make this work.” Sara put a hand on her sister’s shoulder but the succubus took a step back.

“I’m plenty comfortable the way things are, thank you.” Tegan’s voice cracked and revealed her emotional weakness.

“It’s just a date, Teag. 99% chance this is a complete bust. Can you pick me up at this house around midnight?” Sara toweled her hands dry before picking up her phone.

Tegan’s phone notification sound was a recording of one of Sara’s cute penetration yelps. The picture she received was enough to open a rift in the fabric of spacetime in the front yard, provided there was no paranormal interference.

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The succubus paced the bedroom, alone for the first time in a long time, rehearsing how things would go down at midnight. Her best plan so far was to conveniently forget to pick her sister up at the arranged time. Then, when the text asking her where she was came, she would reply she was having a crazy orgy with other demons and lost track of time. That would show her.

But midnight came and twelve-thirty followed. No text from Sara. Tegan did not need to swallow her pride; she was too worried to be angry. A pink portal erupted on the front lawn of the house in Sara’s message. It looked like a decrepit version of the vibrant picture, even when you factored in the darkness. With no additional instructions and a growing pit in her stomach, Tegan let herself in and followed the only light into the basement.

“Hey, you’re late. There’s a lot less of your sister to save now but don’t put this on me.” Jade greeted her guest with a smile, a custom-built jail cell behind her. Sara was in there on a dirty mattress getting plowed by a muscular horned humanoid. Her mind seemed to be melting in ecstasy from the animalistic pounding.

Tegan knew too well the effects of incubus penetration on the female body. She too could force a partner of the opposite sex to cum a hundred times in minutes until his balls and brains permanently turned to mush. She grabbed Jade by the forehead and slammed her against the wall.

“Keypad!” the girl shouted, pointing at the lock to the cell and implying the only key was in her mind. “I’d say she’s three to four orgasms away from turning into a vegetable. Wouldn’t you agree? Whoops, there she goes again. I hope she still recognizes your face.”

Sara’s back arched and her eyes rolled. She screamed louder than she ever did from her sister’s stimulation.

“What do you want!?” Tegan spat.

“How about my boyfriend back? Or seeing my dad more than every other weekend? Do you even care how much you fuck up everything in your path, you fucking dyke?”

“What do you WANT!?” Tegan slammed Jade against the wall a second time. Males in a 3-block radius ejaculated without warning.

With blood dripping from the corner of her lips, Jade explained: “You can’t give me back my life, but you can give me yours. I know about ‘the escape’. Once in your demon life, you can trade bodies with another being to escape certain death. Trade with me. I want your demon body. I’ll set things right my own way.”

Sara came again. She didn’t scream this time; drool was leaking from her gaping mouth.

“Trade with me and I’ll give you the code,” Jade repeated.

Tegan gave her sister a final longing look, her red, fiery eyes to Sara’s empty ones. The light had but faded from them in the throes of her final conscious orgasm. She had no way to know if the miserable wretch would keep her word, but she would sacrifice her eternal life and the next without hesitation to make her sister smile again.

Beams of darkness erupted from Tegan’s facial orifices and her spectral wail forced Jade to cover her ears. Her soul was escaping the body it would never be able to join with again.

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“What happened?” Tegan’s mouth said with Sara’s inflection.

“That fucking bitch!” Jade said, realizing the transfer had taken place without her. There was still leverage in the jail cell getting fucked into a coma, but Tegan’s new human body was on the precipice of brain death.

“Sara, quick, trade with me or she dies!” Jade told the confused new-succubus, risking it all on a final hand.

“Is that me!?” Sara asked of her old body in the cell.

The incubus came a final time inside his overstuffed cream pie and sunk back into his summoning circle, having successfully drained Sara’s body and mind into that of a drooling sex doll. Sara now finally understood why she was in Tegan’s body; that sexy idiot had traded her life for hers.

“*You* did this!” Sara wasn’t familiar with her new powers; she wouldn’t have known how to trade bodies even if she wanted to. However, her human rage was right at home in this powerful demonic vessel and the world, starting with Jade, was about to feel the unbridled reckoning of her broken heart.

Source: reddit.com/r/Erotica/comments/wkynni/succubus_sister_ff_incest_some_mf