The Book of Lilith - Cover

The Book of Lilith

Copyright© 2025 by Igor Blackfire

Chapter 2

Incest Sex Story: Chapter 2 - 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  

Strangely, their relationship did not change at all. Lilith still avoided most human contact, and Samuel was still a big jerk.

The next day happened to be the Friday before spring break, and as usual, Lilith overslept, so she only got halfway through her cereal before Sam started obnoxiously blasting music in his truck and honking, which was code for “I’m about to drive to school without you”. He had before.

She was just scrambling to collect her backpack and jacket when her stepmom blocked her path and plucked at Lilith’s sweater, with a look of disdain at its oversizedness. “Lilith, you’re positively swimming in this, aren’t you? Don’t you have clothes more your size? I know you don’t have, a lot...”

Annette glanced annoyedly when Samuel honked the truck’s horn again. “God, well, I suppose you should go.”

“Thanks. Very helpful, ’mom’.” Lilith shouldered her way past. When she climbed into the shotgun seat, Sam had the windows open and was smoking a cigarette behind the wheel. She scrunched up her face.

He spared her a single glance, then stared straight ahead at the road for the rest of the drive. They didn’t exchange a word. They never did. They weren’t morning people, neither of them. Only when he pulled into their school’s parking lot did Lilith finally pull herself together and speak up.

“So, um ... Sammy?”

“Yeah?” he grunted.

Lilith bit her lip and glanced at the clock on the dash. Fourteen minutes before the bell. “ ... Can we maybe, err, can I hump you to get off, before we gotta go?”

He laughed. But he let her. It didn’t take her very long before she peaked, that time; it was like that in the mornings.


As soon as Emmie and Julia started their shtick that morning, talking about how they figured Lilith must be here by mistake because 12-year-olds couldn’t possibly belong in sophomore year, all Lilith kept thinking about was how they’d react if they knew she’d just been doing incest with her brother before class.

The zingers they could come up with. I mean, good thing mind reading didn’t exist, right? And by contrast, what were these jabs supposed to do to hurt her? They weren’t even true. She did have tits, even if they were tiny. Sam liked them plenty.

She couldn’t suppress a grin, even as they were insulting her. Which was technically breaking her rules about “giving them a reaction”—and of course, comments about her “creepy smile” soon followed.

But none of the taunts seemed to land today.

Lilith was still riding the high of her new experiences and the mega-taboo of it all, and not to mention the high from her orgasm in Samuel’s car less than an hour ago. She imagined all of these afterglows as overlapping videogame-style energy shields that surrounded her and stopped all the bitches’ attacks.


She got horny again in class that afternoon, because she just kept thinking about her new reality with Samuel and how crazy and hot it was. Lilith was nothing if not practical-minded ... one well-placed text to her brother, and one verbal request to Mr. Willam to go to the bathroom...

Hey, she wasn’t even lying.

School bathrooms were, as a rule, disgusting, but the “accessible”, extra big ones for wheelchairs were somehow kept sparkly clean. (Lilly figured that one out years ago—she’d often taken her lunch in there during freshman year, to escape torment from Emmie.)

And she figured that she had several mental disabilities that totally qualified her for using it, too. Like how she might be a nymphomaniac for her older brother. Call it accessibility, the way she borrowed the disabled bathrooms to hook up with him.

Staring at herself in the mirror inside, she wasn’t sure what Sam even saw in her, other than the taboo of molesting his little sister. Her hair she wore loose and unkempt. Clothing; mostly black, oversized on top, tights on the bottom, today floral ones, usually more fishnet or just black.

She really didn’t mix it up very much. Her Dad used to say she had the wardrobe of a cartoon character, always the same ensemble. Or, as Sammy would call it, autistic. Speak of the devil; there came a series of knocks on the door, in a pattern Lilith could only describe as “sarcastic”.

It still, of course, made her heart jump into her throat. “W-who’s there?”

“Your worst nightmare. Open up, Lilly.”

Once he’d re-locked the door, Samuel came up to stand behind her, his arms snaking around her waist as he rested his chin on her shoulder. In the mirror, their eyes met.

“Hey, dipshit,” he said.

“Hi.” Lilith bit her lip. “Asshole.”

“Well, let’s get to it.”

Then he kissed her neck, and she let out a gasp. His hands roved under her T-shirt, to grab her tits—and not gently, but squeezing them like they were lemons or something, then pinching her nips to the point of getting her yelping, knees buckling.

“Fuck, ah. Stoppit Sam.” His groping softened; he used his fingertips to lightly caress from the edge of her boobs up toward the tips, then back down again ... He repeated this pattern several times. It was like one of those scalp-massage thingies, except on her tit. “Yeah ... that’s nice...”

“You love this,” he said with that shit-eating grin. “Doing it at school, I mean. Fucking crazy-ass freak.”

And then he bit her, and sucked her skin, hickeying her, claiming and marking her—and at that point, Lilith could only whimper and nod. “I do. I do. I’m nasty.”

Then his hand was in her hair, gripping it and tugging, and the pain was sweet and welcome. He spun her around, and kissed her on the lips like a girlfriend. She opened her mouth to him. One of his legs pushed between hers, parting her thighs and letting her grind against him. Lilith’s breath hitched.

A moment later, his other hand slipped inside her panties, cupping her. “This is mine,” he murmured, while slipping his middle and ring fingers into her. “Right?”

“Y-yep,” she breathed, her voice shaky, needy. “All of me’s yours. Please, touch me.”

She felt him smile against her neck, and that alone almost drove her over the edge. “What, here? In the bathroom at school?” Mock-shock. His teeth scraped her, and she shivered.

“Yes. Fuck, fuck yes. I want you anywhere. I want it all the time.” She was twitching, and her pussy clenched down on his fingers. “God, nnh, I wish we could fuck. I’d let you, Sammy. I’d—ohhh—I’d beg, let you at school—”

“Total freak.” Sam shook his head. Smug motherfucker. His thumb was pressing down onto her clit, and he was leaning against her, pinning her to the bathroom sink. “You close, Lilly?” He was whispering. “You gonna cum for me? Say it. Say what you are.”

“I’m your little slut, ahn—” Her eyes closed, and she leaned her head against his shoulder. “Sammy. Nngh. Oh, oh, shit—”

She came hard on his fingers. His other hand was at her throat, not pressing, not choking her, just there. It was the hottest thing in the world, and her pussy quaked ever harder for it. Shocks of pleasure rippled out from where his digits were working her—and they kept working all through it—until she was done, a limp pile of a person in her brother’s arms, her heart pounding with the aftershocks.

She slowly opened one eye and gazed at their blushing faces in the mirror. “So, um. Thanks.” She stuck out her tongue.

“You’re legitimately insane, Lilith, I hope you know that.” Samuel was shaking his head. When she opened her mouth, he interrupted, “And yeah, I get it. I touch my sister, so I’m crazy too. But like ... you wanna take this shit farther and farther. I can tell. You’re gonna be the death of me. And definitely the death of us getting away with this stuff you like so much. Ironic, huh? ... Maybe think on that.”

Then he was gone. Lilith blinked at herself in the mirror. “Well, fuck that.”


Sammy was even more talkative on the ride home. “So, Lills, I was thinking, have you ever gotten drunk?”

“No.”

“High?”

She sighed. “What do you think?”

“Really? Nothing?” He met her eyes through the rearview mirror.

“No friends, remember?”

“That’s right, you little loser.” She could see his stupid smirk in the mirror.

Ugh. She turned away to glare out the window. “So, what, you’re gonna spike my drink or something?”

“Uh, no. I was more thinking offering you to get drunk on your own terms, supervised by veteran boozeheads such as myself and Luke and Faye.”

Faye. Lilith screwed up her face. “Tell me, Sam. D’you fuck her? You did, right?”

His face went blank. “Why do you care?”

“I don’t.”

He raised one eyebrow.

“I’m curious,” she amended.

“Well, me and her fooled around a bit when we first met, but no, we didn’t fuck. We never even dated. We were drunk every time it happened. Honestly, that’s why you should drink, Lilly. You might learn how to make friends.”

“Wait, so you haven’t fucked anyone since that one time on holiday?” she asked. He’d proudly announced it to her when he lost his virginity two years ago; that was probably when her fixation with him began, all things considered.

“I didn’t say that.” He smiled.

“So, spill?” she insisted. Why she wanted to know this, she didn’t know, but she did.

“Well, okay. Camping, that girl Laura ... like I told you ... wasn’t very great by the way. Then, a bunch of hand and mouth stuff with Faye all through freshman year.” He paused. “Then girl from my geography class named Olivia ... And, a couple months back, Luke’s little sister.” He grinned and shook his head.

“Damn. The one with the glasses?” Her eyes widened. “Does he know?”

“She’s a freak. Not nearly as freaky as you though, sis. And no, not unless she told him, which ... I doubt. She made me promise not to, so...”

Well, okay then. Her brother had been inside like four different girls—two more than Lilith had bargained for. It was to be expected, ‘cause he was hot, but she still felt a stab of jealousy directed at the whole goddamn bunch of them. But it was a strange flavor of jealousy that was also kind of arousing, which she really didn’t want to unpack right now.

Sam was driving them around town seemingly aimlessly, definitely not in the direction of home. “Where are we going exactly?” Lilith questioned.

“Wal-Mart,” he said.

“Why?”

“I gotta pick up some booze.”

“ ... Why?”

He smiled. “I’ve changed my mind. No Faye or anything, instead I’m bringing booze on the camping trip next week. That’s when you’ll be getting drunk for the first time, with me.”

“ ... Do I get a say in this?”

“What do you think?” He snorted. “Isn’t that what you like?”

“Um. I guess so. I didn’t think it’d apply to non-sex stuff.” But it totally did. She licked her lips. “Can you get something that doesn’t taste too alcoholic?”

“Pussy.” He met her eyes in the rearview. “Aren’t you gonna ask how the hell I’m going to buy it in the first place?” He was grinning.

“Um, yeah, how’re you doing that?”

“With my fake ID,” he answered, emphasizing the words proudly like it was a very big deal. “Got it from a guy Luke knows. It fools everyone, even scanners.”

“ ... Those are real?”

“No ... They’re fake. That’s the point.” His grin widened.

“Ugh. Whatever.” She crossed her arms and glared out the window.


While Samuel was busy with his purchase, after telling her to wait in the car, Lilith slipped into the store on her own.

She made her way over to the Women’s Health section, or rather the smaller, adjacent Sexual Wellness section. At that point, she was stumped by the presence of at least three different things that looked like they could be morning-after pills. Lilith didn’t have a lot of cash, either, and she could hardly ask Sam now.

Glancing across the aisle, she casually grabbed the middle box and stuffed it between the waistband of her tights, lowering her sweater over it so it wasn’t visible at all. Mechanically, as in an anxious trance, she honed in on the soda aisle, picked up a bottle of Pepsi, and ended up at checkout, where she blubbered her way through history’s most suspicious transaction, yet didn’t get caught.

It wasn’t her first time doing this.

Back in the car, she still had to wait for Sam. She buried the box deep in her backpack, blushing. She was probably not going to tell him about that one just yet.


When Sam returned carrying two bottles of bright pink and bright blue respectively, they still sat in the car in that parking lot for another ten minutes. Lilith felt like every minute they spent alone together now contributed to giddy, horny vibrations building between them, inevitably coming to a head.

This parking lot was as good as place as any. Sam made no move to turn on the engine, either. He was just staring at her.

“So ... hey, can I, umm...” Lilith began feebly.

“What?”

“ ... I mean, we’re not fucking, right?” She injected some hope in the question.

He rolled his eyes. “Nope.”

“But can I, like, jack you off?”

“You want to?”

God yes.” Her eyes went wide, then narrowed slyly. “ ... Wanna know what I really want?”

“What?”

“Your cum.”

She grinned at how he flushed. Driven by that momentum, she climbed in his lap, straddling him in the driver’s seat, and kissed him. His palms found her tits so fast it was like they were vacuum-latched on.

She fished his hot, hard cock out of his pants and delicately wrapped her fingers around it. She was deft but unpracticed, and the angle was ... not ideal. Still, judging by the sounds Sam was making, and the look on his face, it was still pretty good. Gosh, what an ego boost. He bucked up into her hand, and grunted cutely.

But her wrist soon ached. Lilith let her forehead fall onto his shoulder, as her hand stilled. “Sorry, Sammy. What good is a sister who can’t even jack you off for five minutes, am I right?”

She pried down her tights and panties, then shucked off one shoe, just so she could rub her own naked, puffy folds back and forth over his throbbing cock. It parted her lips, her slick spreading across the length of him.

Fuuuck,” he said. “We can’t, c’mon, Lilly.”

“We wooon’t,” she whined. “We won’t, I promise, we don’t. Just ... lemme...” She pressed her brother’s shaft flat down between them, her pussy seated on it, and began slowly grinding back and forth as she normally would with clothes between.

She was biting her lip, and a shiver went through her at how dangerously close to the real thing this was. Nothing between them except their own restraint. Mostly Sam’s.

Lilith gasped every time he hit her clit. “Dry-humping ... well, I guess wet-humping... god,” she giggled, then moaned, her lips kissing and sucking on his neck. “Sammy. Can you cum from this? Are you close? Please, tell me when you’re close.”

“Shut up, Lilly.” He pulled on her hair. “ ... And hump faster.”

“Mmhm.” She obeyed, burying her face in his shoulder, gyrating her hips to ride him better, harder. Their combined wetness made little squelchy sounds, and it was hot, so hot, down there.

And then he called her a good girl, and she wailed in pleasure. A little performative, but that too was good. For him. She was for him now. Soon enough his breathing was ragged too, and his hips bucked back up, sliding his cock against her folds. “Ah, Christ, Lil,” he panted. “Lilly, I’m gonna—”

Haah—Can I please put it in?” she whined. “I want you to fill me up, Sammy, mmh, I got a Plan B and everything!”

Samuel growled and pulled hard on her hair, jerking her back, and he took his cock in his own hand right as it started spurting. The first rope landed on her thigh, the feeling of the hot wet line on her skin intoxicating; others landed on her sweater, her pubes, her hand, and some dribbled on the seat.

Lilith didn’t even think about it. She immediately brought the cummy hand to her mouth and licked her palm clean—making sure he was watching, too. Then she clambered into the other seat, so she could lean over and lick his shaft clean too.

“Fuckin’ slut.” He tugged her hair playfully.

“I don’t hear you complaining.”


Lilith and Sam’s older brother, Ezra, was in his late twenties, and had moved out so long ago that Lilith could barely remember the era where he lived at home with them. She’d been a little kid, then, and nowadays Ezra didn’t visit them very often, to the point where he was really more of a distant uncle-like figure than a brother to her.

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