You sit on Rose's bed, naked, reading a manga. Different day, same shit.
"Is Luffy ever gonna find this One Piece or what?" you groan. "He's been looking for it for like fifty years. It's getting to be a bit... absurd, frankly."
"Uh huh!" Rose chirps. "He'll find it for sure."
"Yeah? When?"
She shrugs. "When the story gets around to it..."
Sighing, you flip the page. "Maybe he'd actually find it if the dumbass author didn't keep doing filler arcs."
"But the filler's what makes it fun!" Rose insists.
You toss the manga to the floor. "The filler is what makes it profitable. Not fun."
"Don't throw my things around," Rose says, pouting. "That's so mean."
You flip her off.
She slithers on her belly to the edge of the bed. Poking her upper half over, she leans diagonally at a precarious angle, bobbing, and hyperextending herself to reach for the discarded book. Her fingertips can just barely hook under the manga's cover and weakly nudge it towards her, where then she can get a better grasp on it. Her tongue pokes from the side of her mouth the whole time, and she seems to be working up a minor sweat from the exertion. You get the urge, which you resist, to slap her ass, shaking at you undefended and half-bare from under her low-cut negligee. This house is corrupting you, too. Maybe it's built on an Indian burial mound. Chief Fucks-Like-Bull.
Finally Rose succeeds at her task, after a much more laborious effort than simply getting off her damn bed and picking it up from the floor would take. She sets the manga gingerly down on her messy nightstand, turns to you, wipes her brow with the back of a palm, and says: "whew."
"I think you're retarded, Rose."
"Rude!"
She flops onto her back with limbs thrown wide as if to make a snow angel. After lengthy silence, she asks: "sooo... are you sleeping here tonight or what?"
"Sure."
"Sugoi! But... I thought you were sleeping in Ally's room from now on. Not that I mind the company!"
"D-- Ally went to Palau."
"So? He didn't take his bedroom with him, silly!"
"I'm not sleeping in his bedroom because I love the decor. I'm sleeping in his bedroom so he'll put his dick in me. Can't get dicked by a guy who went to Palau."
"What is Palau, anyway? Is it part of Hawaii?"
"It's its own country."
"Like Hawaii?"
You lean against the headboard and watch the slowly rotating ceiling fan. Rose is watching it, too. "I don't get Alabaster," you tell her. "He said he'd let me sleep with him. Then literally the very next night he skips the country. Really knows how to make a girl feel wanted."
"Awww. Are you sad, Amber? Need Rose-nee to make you feel happy again?"
You lightly kick the top of her head with the heel of your right foot.
"Oof," she grunts -- in surprise more than pain.
The dull hum of the house's central A/C is the only noise for the next couple minutes.
She flips onto her tummy and stares up at you with curious eyes. "Hey. You never did say." She grins mischievously and lowers her voice. "Did Ally do it with you last night?"
"Do you think I'm pretty, Rose?" You ask.
She looks confused. More than normal. "Uh. Well yeah. Of course. You're the most kawaii imouto I could hope for!"
"So there you have it. I'm a pretty girl who spent the night in Alabaster Soliloquy's bed. Can you solve this equation on your own or do you need some more help?"
"Hee. You're such a slut, Amber!"
You roll your eyes. "You're one to talk. Little Ms. 'Fuck-Kitten'." You try playfully to kick her again. But with Rose watching you this time, she can intercept it. She catches you, one hand on your calf, the other around your ankle.
And then she kisses the ball of your foot.
Your eyes bulge with disbelief. Next comes the wet, ticklish sensation of Rose licking your arch. It's a lingering and luxurious motion, her face drawing slowly up as she licks you. You jerk yourself bodily back, recoiling from her.
"You taste gooood," Rose croons.
"You fucking freak."
"Yep~" she agrees with a giggle.
You let the initial rush of anger pass, and consciously decide to relax. Tension drains slowly from your body. You knew what you signed up for, after all. Hanging out naked in your older sister's bedroom is just asking to get sexually violated. It's fun to court it. Provoking your idiot sister into doing obscene things.
"Well? How was it?" Rose asks.
"Getting my foot tongued by my own sister?"
"You silly~"
"Fucking Alabaster?"
"Uh huuuuh."
You let your knees drift slightly further apart, so that Rose has a better vantage on your pussy -- you like this, letting her see you get all wet. With her on her tummy in front of you, she's right at eye level with your wet, quivering little holes. "It was fun. He climbed on top of me and fucked me like he was raping me."
"Isn't that the best?" She says excitedly.
"No..." you say. Your voice is getting a little bit pinched as you think about what actually is the best.
"No?" Rose repeats.
"The best --" you gulp. "The best is when he cums."
Rose has her hands on your thighs. "Can I lick you?"
"You-- w--"
"I want to make you feel good while you tell me all about it!"
You shift your weight back and let Rose spread your legs. Best not to resist. You see only the pink crown of her head as she dives in and begins to eat you with enthusiastic mewls. You shudder, running your hand through her gaudy hair.
"It's just crazy, how hard he cums," you say. You bite your lip as your older sister's tongue penetrates your dripping cunt. "And he doesn't even warn you... he just does it."
"Mmm hmm," she moans into your pussy.
You stare transfixed at the incestuous oral action you're getting. "It's so hot when he cums in me... I don't mean hot as in sexy... well, it IS sexy... but it's also literally hot. It's scalding hot. It's -- like his cum is burning me up inside..."
"Um hmmmm."
"Fuck, Rose, you're so good at this--" you bite your fingernail and try not to scream out in joy, lest anyone else in the house overhear the way you're riding your sister's face like a horny bitch.
Rose leers up at you. "Ally's sperm is the best, isn't it!"
"We -- we should stop," you say.
Rose looks disappointed. "You don't want me to lick you?"
"Not that. I mean we should stop letting him cum inside us. That's dangerous... we should make him wear a condom at least."
She shakes her head emphatically no. "That's no good. First off, he doesn't like 'em. Ally has plenty of girls to bareback. So if we ask him to wear a condom, he just won't fuck us!"
"He wouldn't be like that -- would he?" You bargain.
Rose shrugs. "Well, second of all. It's no fun for us either if he's got a condom on. You said it yourself. The best part is feeling his cock filling you with sperm!" She winks. "And you can't get that if he wears a condom!"
You shiver. And you can't dispute her argument. You lightly stroke your belly around your navel. You're feeling that itchy throb deep within again, that mounting need to get spunked. It's reaching a fever pitch less than 24 hours after the last time he fucked you. There can be no denying it, you're addicted. You're addicted to Alabaster cumming inside you.
"You're on the pill, though, right?" You ask.
"Nope. That'd be cheating!"
You exhale. "Cheating? How?"
"Not like NTR cheating. Like cheating at a game cheating. Part of what's so hot about letting him sperm inside you is how risky it is... right? It's no fun if it isn't actually a risk!"
"Oh my god," you say, even as your pussy clamps and shudders.
"You can do whatever you want," Rose says, "but if you reee-eeeally wanna be Ally's cum dumpster, you can't be on birth control! That's no good either!"
Without any warning, Rose dives back in and resumes licking you out. You stare at the ceiling, half-dazed, legs cramping with the sheer pleasure of depravity coursing through your muscles. Your own sister is eating your cunt while waxing lyrical on the joys of maximally unsafe sex. "We --" you moan, gulping, "--we could both be pregnant right now, do you actually understand that?"
Her only response is to redouble her efforts on your cunt. Her spit mingles with your juices and what she doesn't lick up is pooling around your ass on the sheets. You're sitting in a warm puddle. She laps at you like the hungry fuck-kitten she told you she was.
"You're gonna make me cum," you tell her.
"Go ahead," she says. Her voice is muted, and you can only see her face from above her nose. But she's making direct eye contact -- and her eyes are shining bright.
"This is bad..." you grunt. "This is so bad. I'm gonna cum on your face--"
"That's fine -- that's totally fine -- cum in big sister's mouth, okay?"
She runs her hands under your ass and pulls you into her. She mashes her tongue as deep as she can get it, to suck out all your dew. You ball your fists and hold them tight to your chest, close your eyes. It's beyond all description, the sensation of getting your clit tickled by your older sister's slutty pink tongue.
You cum. You can't help yourself; your little slut pussy cums all over the place, and your sister drinks it down with a giggle.
But afterwards -- as you lie entangled with each other in a way you haven't since you were both very little girls, Rose's arms around you and chin on your shoulder, you admit the truth to her.
"Can I tell you something gross?"
"I like gross~"
"Don't take it the wrong way. I really like cumming with you, but... it isn't enough. I think... I think I'm an even bigger slut than you are. No matter how much I cum with other girls, it just makes me hotter--" you gulp. "--It makes me hotter for dick. I... I get this itch inside, you know... deep inside... for dick."
Rose rubs your tummy right at the offending spot. Maybe she understands after all.
You go on. "It's not just that I like doing it. I kinda feel like I need it. I could cum a million times but I won't ever really, actually cum until I feel that spot getting splashed with jizz. Everything else, it just feels like foreplay..."
"I get you. I totally get you. Nee-chan understands."
You turn awkwardly around, your sweaty skin peeling away and resticking to hers as you rotate. You stare into her eyes. "Do you?"
She reaches between your bodies and lightly strokes your cunt. "We can keep each other feeling good, but you're 100% right. Getting cummed inside is the best." She pecks you on the forehead, then on your lips -- and that peck becomes a long, obscene, incestuous French kiss that has you moaning sweetly into one another's mouths. You cum a couple more times against her hand.
When she finally gets her tongue out of the back of your throat, she gives you her advice: "Keep Ally happy and I'm sure he'll cum in you lots and lots!" She nibbles your ear then, even as she keeps molesting you. "Everything's easier if you just accept that you're his personal cum hole now... and that your cunt belongs to him..."
You drift to sleep with your sister stroking your pussy and whispering in your ear about how fun it is to be a living fuck-dump for Alabaster Soliloquy.