The Book of Lilith
Copyright© 2025 by Igor Blackfire
Chapter 1
Incest Sex Story: Chapter 1 - Lilith Ripinski is a 15-year-old loner, with an annoying 17-year-old brother named Samuel. One day, he pushes her just a little bit too far, and they enter into an intense, surreptitious sexual relationship. "The Book of Lilith" chronicles the development of their incestuous dynamic, their struggle to keep it secret, and the way Lilith's confidence grows as a result of feeling desired for the first time.
Caution: This Incest Sex Story contains strong sexual content, including mt/ft mt ft Teenagers Consensual Reluctant Heterosexual True Story School Incest Brother Sister DomSub Rough First Facial Masturbation Oral Sex Spitting Public Sex Small Breasts Slow
April 2018
“Honestly, y’know, I don’t feel safe in the classroom with her. She just gives me the creeps!”
“ ... What?” giggled Julia. “Are you saying you’re scared of the retard?”
“Well, no, but look at her!” Emmie hissed back, jerking her pretty blonde head towards Lilith. “I’m convinced she’s gonna shoot up the school or some shit! She looks so dead inside!”
They were whispering just a little too loudly. Performative, with the volume calibrated just right so that Lilith could overhear every word, while Mr. Richards at the front of the class was none the wiser. Sure, he’d hear the occasional giggle, but the culprits were charming, pretty girls, who got a pass for that kind of thing.
“Right,” Julia continued. “She definitely has that psycho vibe to her. They should check her locker.”
Emmie Sullivan was popular and pretty, but that was really all she had going for her. There was a good chance she’d peaked already with Project: Make Lilith’s Life Miserable, which went back all the way to middle school.
Julia, on the other hand, was simply the type of psychopath who liked bullying for the love of the game, and had correctly identified that bullying Lilith also let her climb the high school social ladder, as henchwoman to the queen bee or whatever.
It was truly a match made in hell.
“Yeah, I bet she cuts herself,” a third preppy girl chimed in. This one, Lilith didn’t even know the name of. She was a recent transfer. Emmie cackled like it was the best joke she’d ever heard, and New Girl beamed. Heartwarming.
Lilith had never cut herself, in fact. Why would she? That would just be full-on doing Emmie’s job for her. Ridiculous. If everyone turned on her, at least Lilith would never turn on herself. If she had to cut anyone, it’d be Julia ... but that would probably cause a lot of, like, legal issues, she mused, staring up at the ceiling fan. She knew she could never do anything like that—her family finding out about the bullying was just about the worst-case scenario. Still, going Carrie was a nice fantasy.
In the background, a few more comments were made about how she was a creep and whatnot. At this point it was just the same three jokes on repeat, so she tuned it out easily.
If the objective was to make her hate herself, they’d failed; Lilith had hated herself long before meeting either of those bitches. Really, they had no idea how fucked up her mind truly was—and so all their jokes fell flat, because they didn’t even push the right buttons. Sure, she dressed in oversized sweaters, and let her hair grow too long. Big deal. They should see her AO3 and Pornhub history, to get inspiration for the real hard-hitting zingers.
Thank god the chances of that were very low. Thank god Lilith still had her online life. Her real one was depressing. Though there was a certain lazy, resigned comfort in being the victim: Lilith could go entire school days without speaking to anyone, just browsing Reddit all day, and some of her more sympathetic teachers let her do group projects solo. And she didn’t have to bother with makeup (or showers, sometimes), because when nobody likes you, self-care is rather superfluous.
When finally the bell rang, she was first out the door. It was lunch hour, so Emmie & Co. probably wouldn’t follow, but out of habit Lilith still made sure to turn the corner before they emerged from the classroom. It was all about line of sight.
She shuffled her way through the hallways. The school day was only half over, and she was already feeling like she needed a nap.
When she arrived at the picnic tables outside by the cafeteria, her brother Samuel was already there, with two of his buddies, smoking cigarettes and having an animated argument about something stupid. On her brother, the wavy black hair was messy in a hot way instead of a homeless way like Lilith’s. And, in Sam’s case, being an edgelord didn’t invite bullying, if anything it attracted people. Most people at school knew him, even though he wasn’t popular in the traditional sense, more like the closest thing you could get to popular while also being sort of a weirdo.
Honestly, Lilith hated him.
“Hey, freak.” He barely spared her a glance before turning back to his friend. “So anyway...”
His best friend was a natural ginger named Faye who dressed like a hippie. Lilith wasn’t sure if Faye and her brother had ever dated, but she was 99% sure they had at least fucked, just from their looks and jokes.
Honestly, Lilith hated her, too.
She closed her eyes and suppressed the urge to flee. She didn’t like doing social interaction any more than strictly necessary, let alone in front of an audience of seniors who Sam had probably told every single Embarrassing Lilith Story over the years. Anxiety bubbled up in her chest like a lead weight. But then, so did the growl of her stomach, which reminded her why she was here in the first place.
She took a deep breath, and began, “Umm, so like, about the, uh—”
“Cool style, Lilith!” interrupted Faye. “I like your Doc Martens.”
“Huh? Oh, yeah. Me too,” Lilith said, eyes locked on those very same boots now. Small talk washed over her, much like the bullying did. She didn’t want to be acknowledged.
“What do you want, Lilly?” Sam sneered.
She scowled up at him. “C’mon, Sam. I go Mondays without lunch so you can buy your stupid fuckin’ cigarettes and crap ... You have to give me lunch money the rest of the week. You promised.”
His response was to blow a cloud of smoke in her face. Lilith scoffed and scrunched up her nose.
“ ... Maybe if you ask super nicely.” He added, wagging a finger.
Lilith sighed. Her brother loved these little power plays. But it was really their stepmom’s fault for entrusting their combined lunch money to him and somehow assuming he’d divide it fairly between them. What?! The same guy who stole money from Dad all the time? Seriously. Is everyone in the world stupid or what?
He was still smirking at her. Lilith flushed. He was expecting some kind of begging here, she knew. Well, alrighy then.
“Pleeaase, Sammy?” she went. “C’mon ... I’m hungry.”
His redheaded friend nudged him sharply, shaking her head and sparing Lilith a glance of profound pity. Lilith looked away and kicked at the ground. She didn’t need pity from Faye, or from anyone. Though, when the result was Sam taking out his wallet and shoving ten bucks in her hand, she could forgive it.
She didn’t thank either of them; her mind was already on those triangular pre-made box sandwiches from the vending machine that she liked so much.
As you might expect, with a brother like that, going home at the end of the day didn’t exactly buy Lilith Ripinski a reprieve from bullying. Sam’s took a different form, and unlike Emmie’s brand, there was no escaping it ever; he drove her to school and back, and they shared a house for god’s sake. And since Lilith spent all her time in her room, he always knew where to find her.
Indeed, sprawled on her bed in the afternoon reading A Game of Thrones for the fifteenth time, she gritted her teeth as her brother’s voice echoed through the hallway:
“Lilly! Lilly, where you hiding out, you lil’ creep?”
“I told you not to call me that!” she yelled back.
No, not the creep part ... she was used to that. That was just what he called her. It was the Lilly that bothered her ... nobody but Sam called her that anymore since elementary school.
Sam loitered maliciously, leaning against her doorpost with a stupid smirk on his face.
“Well, what is it?” Lilith demanded.
“Huh? Can’t I just wanna spend time with my favorite sister?”
“Uh-huh.” Lilith rolled her eyes, and went back to reading.
“Hmm? What’re you up to? The incest book again?”
“Fuck off, Sam.” She looked up at the ceiling in despair. “Just leave me alone.”
“See, this is why you have no friends, Lilly,” Sam said. “You’re always such a toxic little bitch.” He came even closer, till his knees hit the edge of her bed.
“What—Sam! Get away, retard!” To Lilith’s brain, a grinning Sam was one of the most menacing sights; it made her hair stand on end, Pavlov-style, fight or flight. He was going to do something like poke her, pull her hair, give her noogies. Cheerfully.
She backed away, towards the wall behind her bed, even though really, there was no escape. Frustration welled up; on a whim, she threw the nearest thing at him—her backpack. Too late, she realized her laptop was in there, but that just made it all the more effective as a weapon.
The bag hit him in the stomach, eliciting a deeply satisfying oomph, a groan, and a stumble. And a deep feeling of justice, a rush of schadenfreude ... but it was all very short-lived. When he stood straight again, looming over her, her eyes barely had time to widen before he pounced on her.
He pinned her wrists with his hands, and her legs with his full weight. Slowly, deliberately. “You never learn, do you, Lilly,” he tutted, shaking his head.
“Fuck you!”
Her struggles were to no avail; they only amused him more, and it was hard not to feel defeated with his infuriating grin inches away from her face. That ‘I’m in charge here’, grin, reserved for when they were alone.
“What’s got your panties in such a twist today, huh?” he went. “Your boyfriend dump you?”
“I don’t even ... no!” Lilith scowled. Like anyone’s interested in me.
“Oh, right, because you don’t have friends.”
“I do,” she protested half-heartedly, while wriggling around some more in another feeble attempt to break free. Fuck herself for being so much smaller.
“Riiight,” drawled Samuel; “name one friend.” And when she opened her mouth, he quickly added, “—who isn’t from the internet.”
Lilith closed her mouth again, glaring at the wall.
“Exactly.” His smirk widened; she wanted to strangle him. “Soo ... no friends, no boyfriends, does that mean you’ve never made out?”
“How about that’s none of your fuckin’ business?”
“Oof ... that’s sad, Lilly,” Sam teased. “Most girls have at least one or two notches in the bedpost by the time they’re 15. No wonder you’re always so grouchy. You just gotta get laid. Though, I suppose that’s kinda difficult, with no friends?” He made it sound like a neutral interview question.
Lilith glared, and felt a blush creep up her cheeks. Sam’s jokes were about as repetitive as Emmie’s, but it was all high-precision needling at her status as a very thirsty 15-year-old gooner with absolutely zero shot at ever getting any experience under her belt, which hit a lot closer to home.
“Well, Silly Lilly,” Samuel continued, breaking out an even worse nickname, “step one is to smile.” He used his fingers to push up the corners of her mouth. “Like this. It’s what people do when they’re happy ... Hmm, it’s not working.”
“I’ll smile at your funeral, dick face.” She jerked her head to get her cheek away from his hand, but he just followed. “Stop it—ngh, fuckoff.”
By now, she’d actually half-managed to wriggle out of his grip, but her shirt had ridden up. And he honed in on that exposed skin like a shark out for blood ... Suddenly his fingertips were on her waist, tickling her.
“F-Fuck! Stahahahap!” Lilith squealed.
“Not until you admit, out loud, that you’re a loser with no friends,” Sam went, and she could feel his breath on her ear, giving her goosebumps. It was only a short reprieve before he went back to tickling.
She lost her breath quickly, her legs flailing. “ ... Fahahack—fine—I’m a loser with no friends! I’m a loser with no friends! Uhaha! Just stooohp!”
To his credit, he did stop. He still didn’t let her go, of course. No, he lazily pinned both of her hands again.
Lilith let out a sigh. Somewhere around two years ago, Sam had discovered that he could fully hold her down like this, for as long as he felt like, whenever he wanted. She just had no chance against him, physically. He made greedy use of that fact when it was just them. He liked it a little too much, too.
She met his gaze head-on, and they were locked in a staring contest; him smirking, her scowling, neither giving an inch. His grip on her wrists tightened a fraction, and she narrowed her eyes.
He was pushing it today. Well, alright then. She could break out the nuclear option. From this angle, there was no hitting him in the nuts, so her one remaining recourse was verbal.
“ ... Why are you always touching me? You know we’re related, right? Sicko.”
As expected, Sam let her go immediately as if hit by a taser. “Jesus. Don’t even say shit like that,” he muttered, backing away looking almost apologetic.
“Yeah, well, you’re the one who’s always on top of me, asshole.”
“Anyways, I wouldn’t fuck a girl with zero tits,” he added helpfully, his grin recovered.
“Screw you.” She kicked in his direction, but he was already halfway out the room. “Whatever. Why don’t you kill yourself, Sam!”
“See. It’s like I said. Toxic little bitch.”
Lilith put the book down and faceplanted her pillow. God, what a jerk. Always with that shit. She curled up in her sheets, put in earbuds, and spent the next hour feeling bad about her sucky existence while listening to extra sad music.
Dinner came. Their Dad ... didn’t. Ben Ripinski was far too busy as the CEO of a mid-sized regional importer of plastic cutlery to make time for something as basic as family dinner. Right now he was in Denver. Or Dallas. Or something.
Lilith was the last in her seat at the round table, which was like being late to class but worse. Especially because Annette had made an elaborate risotto of some kind. When it was just the three of them—her, Samuel, Lilith—dinner was whatever could be reheated in under ten minutes, but with Allie present she always set the table properly, cooked from scratch, and served it on the nice plates.
The risotto was really good, of course. Lilith ate it in small, deliberate spoonfuls and didn’t say a word to anyone. Conversation was a trap. You said one thing, and then you were expected to say another thing, and suddenly everyone was looking at you weird because you said something off-kilter.
“—literally the only person who signed up to help carry the backdrop panels, Mom. The only one. They’re huge, too, like six feet tall?”
“Well, that’s very nice of you, sweetheart. Though, you shouldn’t strain yourself too much before your match on Saturday.”
“It’s fine, Mom,” Allie groaned. “They’re not heavy, they’re just big. Anyway, Ms. Hernandez said I could recruit people to help, so I asked Cassie, but she just laughed at me and called me a teacher’s pet!”
Luckily for Lilith, most dinners took the form of her fourteen-year-old half-sister narrating her entire day for Annette’s benefit. A real yapper, that one. It was a load-bearing responsibility, to be the only one standing against a tide of weird, resentful silence, but Allie was the right kind of oblivious for the job. There was no performance there, just earnest love for the world. She just liked her life, and all the people in it. Lilith found it disturbing sometimes.
Suddenly, Allie turned to her, and Lilith’s heart caught in her throat at the prospect of social interaction. “Lil, you should come! To the showcase. There’s gonna be art stuff!”
Lilith hadn’t been paying nearly enough attention to actually remember what the hell kind of showcase it was. “I’m good. I don’t like ... things.” So smooth. Good talk.
Allie’s face did the thing where it flashed hurt-resignation-acceptance in one nanosecond—her standard response to Lilith—and turned back to address her mom.
The whole time Sam had been quiet, which was worse than when he talked, because it meant he was loading up. Sure enough, he leaned over under the guise of reaching for the pepper:
“Sooo, freak,” he murmured, low enough to live beneath Allie’s continued chatter. “Big plans tonight? E-sex orgy in the furry Discord?”
She ignored him.
“C’mon. Don’t be like that. I’m just curious what you get up to, with your door locked all night and whatnot. I have to assume most of it’s spent with your hand between your legs.” His grin widened. “Who’s the unlucky bastard in your silly fantasies, huh? Or are you a dyke?”
“Can you stop?” she muttered, eyes fixed on her plate.
“Can you two not, please?” Annette snapped. “Not today ... I’ve had a long day.” Annette’s gaze settled briefly on Lilith (as if Sam whispering gross shit in her ear was half her own fault) before returning to Allie. “Sorry, honey. The showcase—you were saying?”
Annette’s face while she listened to Allie was the part Lilith really got stuck on, though. Her jaw softened, her eyebrows lifted, her whole face just sorta rearranged into something approaching warmth. It was a face Lilith had never been on the receiving end of. When dealing with her or Sam, Annette always looked strained.
Sam nudged her thigh with his knee under the table. She flinched. He just chuckled.
“—and then, y’know Coach Dave? He said I had by far the best backhand of the whole JV squad!” Allie was saying, beaming, bouncing a little in her seat.
“That’s wonderful, Allison.” Annette reached across and tucked a blonde curl behind Allie’s ear. The gesture was so casual, so automatic, so motherly.
If Lilith died tomorrow, nobody would really know who she was, the way Annette knew her daughter. Maybe if she left a note with her passwords on it, Samuel would enjoy the material. For making fun of her in his eulogy. Which would doubtlessly be the highlight of her funeral.
“That’s great, Al,” Sam echoed. And the weird thing was, he sounded like he meant it. He’d looked up from his phone and everything. Allie was so adorable even Mr. Edgelord himself couldn’t help but be nice.
Allie turned to her a second time with a big smile. “Lil? You’re so quiet. What’d you do today?”
“Nothin’.”
“You always say that. C’mon, something has to have happened.”
Oh, y’know, Julia from your tennis team called me slurs, so like an average Thursday really. “I go to school. I sit there. Then I go home and sit at home,” she mumbled instead.
That was too much of a non-sequitur. A classic awkward silence descended upon the table, and Lilith felt a strange satisfaction.
“Jesus, Lilly,” Sam drawled. “Don’t act so depressed. Don’t you see we have it great around here?” He gestured. At the effort put in for Allie, that they were only collateral beneficiaries of. His eyes told her that was the joke; one that neither Allie nor Annette picked up on. A joke just for her. Solidarity. She smiled a little.
“Yeah, Mom!” Allie chimed in. “I love risotto!”
After all that, Lilith was relieved to retreat to her own room at the first opportunity. She made sure to rinse her plate and put it away, so Annette had absolutely no reason to complain, then fled whilst Sam was stuck in conversation.
He wasn’t wrong or anything. About the degenerate thing, that is. Lilith loved touching herself, and was definitely going to do that right now, yessir. After dinner was the guaranteed reprieve, because Sam needed to smoke weed for an hour after every meal, so yeah. Also, she’d spent the whole day edging at school again. Anxiety and arousal were basically the only two feelings Lilith felt, and the more time she spent horny, the less time was spent crashing out.
She even diligently finished all her homework while fidgeting on her chair with her thighs pressed together, just to torture herself that little bit extra. When she cleared the last quiz answer, she basically flung herself onto her bed face-first, shedding her tights so haphazardly she almost ripped them as she pulled her phone out.
AO3, filter by rating: Explicit, of course. Additional tags could end up anywhere from generic yaoi shit to hardline Dead Dove, depending on what kind of day it was. Today, it was a very Sibling Incest kind of day in particular, she felt. Mmm.
Tonight’s first fanfic was quite dark already, with a big ol’ age gap. She scrolled with one hand, and teased herself with the other, a logistical skill she’d mastered around age nine. Her fingers skittered across her vulva and asshole, brushing lightly.
Lilith knew her body well. She’d discovered the mysteries between her legs at an early age, and thoroughly explored them since. She liked to marinate in it, to let the tension coil ‘till she was so hypersensitive she could squirm over the edge with a thought. Those were the most fantastic orgasms.
The first fic turned out to be unfinished, but she was trying to leave herself hanging anyway, so it was pretty much in line with the program. The next one was about two sisters, one mean and standoffish, the other gullible, and there was some non-consensual sleepytime molestation going on. Hot. Lilith’s second-biggest fantasy was getting raped by a girl.
Her third and final pick of the evening was about a whole bunch of siblings, including some even younger than Allie, all getting it on, in a big house without parents. They really wrote all of them to be different little archetypes and it was cute, but there was also a bunch of peeing that really didn’t appeal to her. She left a comment saying exactly that.
Lilith sighed and put the put the phone away after that. Fics never quite did it anymore. There was the option of watching Pornhub, but Lilith decided that today she was allowed to bring out the nuclear option: she closed her eyes, and thought of doing it with Sam and Allie while she jammed fingers inside both her holes.
She pictured a world where Sam and Allie both used her as a kind of free use sex slave. In this timeline Sam was an evil piece of shit who did unspeakable things to her that she secretly enjoyed, while Allie would be nice and apologetic ... and comfort her after. She came within the first minute.
Post-nut clarity hit like a truck, naturally. This type of stuff she reserved only for special occasions—a.k.a. when she was really upset at Sam. Allie was more of an innocent bystander, who mainly got roped into it when she started developing because Lilith was a freak and a raging bisexual, and because her half-sister’s body was so much hotter than hers, and ... Yeah.
Unfortunately, on her way to wash off the shame, and cap off her evening ritual with a nice, calming bath, Sam himself caught Lilith by the arm in the hallway, yanking her back. “Nah, nah, I’m showering first. You fuck off back to your autistic little gooncave. I can smell it on you by the way.”
She blushed. He could see right through her, of course. Yikes.
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