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the bond between two twins is deeper than you think

Summary:

Omori takes good care of her sister, like every younger twin should.

Notes:

i love twincest and i think omosun is PERFECT for this trope sooo... and i love genderbending too, if you couldn't tell lol!
alsoooo when i write fem sunny she's usually more shy and awkward than how i usually write sunny, fyi

(See the end of the work for more notes.)

Work Text:

“Ah, look at you... you're already so wet, hm?”

Sunny couldn't remember how she had gotten into this situation—how they had gotten into this situation.

But what was certain, for sure, was that she was dying of shame—and probably of something else, and couldn't help but hide her face in her hands. A part of her was afraid to move them away and see what she feared the most at that very moment...

Her twin—her younger sister, who was settled between her legs and had a hand caressing over her panties.

She swore she didn't remember why or how, and maybe she just didn't want to remember it, anyway. Poor Sunny was lying on her bed in her underwear, towering over by Omori who was dressed just like her—the rest of their clothes were scattered on the floor. Omori held her thighs apart with one hand on one knee, while the other... while the other played against the damp fabric of her panties. Sunny bit her lip when a finger brushed against that sensitive spot again that made her scream, her body tensing.

“O—Omori...”

“Yes, big sister?” Omori teased, pressing her fingers a little harder against her. She wanted to do more so badly, but refrained for now. “Do you like it when I touch you here?”

She should say no. If she was in her right mind, she should say no and even tell her to stop this mess immediately—

But for now, Sunny wasn't in her right mind.

“I...”

“Ah, no need to answer,” her sister said. “The mess in your panties is already answer enough.”

At her words, Sunny blushed even more than she already was—if that was possible, at least. She shouldn't be like this because of her twin, they shouldn't even do this! But something—something about Omori kept her from refusing her whims. Even though she was the older one, she had always had... this feeling of inferiority and submissiveness towards her. And today, it had gone to a higher level. A barrier they shouldn't have crossed—but they did anyway, it seemed.

Sunny tensed again when she felt fingers slip under her panties and—

“I—I, Omori wait!” She straightened up in a panic, breathing heavily. Her hair was a bit messy, despite still being in two separate pigtails.

“Yes?”

“We shouldn't... do this,” she finally managed to say. She looked away to the side, not daring to see Omori. But her younger sister seemed to have other ideas, although her gaze was still as impassive.

“It's true that we shouldn't, but you don't really want to stop either, am I right?” Finally, her neutral face quickly turned into a smirk. She knew what she was doing. “Otherwise, we wouldn't both be in our underwear already, and I wouldn't have been touching you for ten minutes without you protesting for a single second.”

Urgh.

Sunny wanted to hide in a cave, ashamed.

Because Omori was right.

She shouldn't have let herself be undressed in the first place, much less let herself be touched between her legs while moaning like that.

And yet—

“Admit it, you're a freak who likes to be touched by her little sister,” her twin said, in a sharp tone. Her eyes were narrowed.

“Omori!” W—why did she have to say it like that?!

“The truth hurts,” Omori shrugged. “Now, let me pick up where I left off...” She had barely said those words when a finger touched Sunny's clit again, panties down, and she immediately fell back onto the sheets with a sigh. Omori continued to caress her and soon, she was arching her back, rolling her head into the pillow. “Good girl.”

She—

She wasn't a good girl—

She shouldn't be called that in the first place but—

She couldn't help but like it.

“It's nicer when your panties aren't in the way, uh?” Omori chuckled darkly. One finger continued to touch her clit, while another eventually slid down and stroked her entrance for some time, and the gesture made her older sister arch her back again, and move her hips. As if she were looking for more friction. Like the little pervert she was, after all. She had always had an overactive imagination, actually, but Omori was sure that being touched so deliciously by her twin wasn't in her plans, huh? It was true, only freaks fantasized about that kind of stuff.

Luckily, Sunny was one.

Speaking of which, she rolled her head to the side, trying to shamefully escape her sister's eyes. It was futile.

Her hands came back to cover her face, and Sunny barely breathed:

“O—Omori, please...”

“Hm?”

“Put a... put a finger inside...”

Oh.

A smirk appeared on Omori's face again. It was dangerous.

I knew it.” Without waiting, her wish was her command: a finger slowly slipped inside her, and Sunny moaned in pleasure.

It was tight, of course, but also wet. Abundantly wet. It was no surprise, considering how long she had spent teasing her. She didn't wait to start her thrusts, gasps and dirty noises filling the bedroom. Sunny might have thought that hiding was the solution to all her problems, but the truth was that it wasn't. She had to face the truth, sooner or later. And that truth was right in front of her, actually: she liked being fingered by her sister. Omori wasn't any better, of course. She herself knew that they shouldn't—but how could she stop, when her twin was so adorable and submissive just for her? So easily?

Two completely freaky siblings.

It suited them, in a way. Let's just say that one was more honest about it than the other.

“Hmph, Om—Omori!” Sunny sighed heavily, her hips moving in time with the finger inside her despite her will. Her legs spread wider, offering herself entirely as she drowned in pleasure. “Omori, please, please—”

She was close.

What a dirty pervert.

That didn't stop Omori from speeding up her movements, licking her lips as a filthy thought had just crossed her mind. Although her older sister couldn't see her—far too busy moaning her name, she devoured Sunny with her eyes. The hair on her forehead was matted with sweat, her cheeks were red. She should be ashamed.

She shifted a little, silently readjusting herself.

Finally, Omori spoke again and—

“Cum for your twin,” she ordered. “Cum for me.”

She had barely uttered these words, when a squeak escaped Sunny, quickly followed by a cry that made her arch violently forward. She hadn't come—not yet. She was screaming because a tongue had just licked her clit.

Omori only had time to spend a few small licks, however. Sunny had just furiously moved her hips against her, rubbing herself against her tongue when finally, a whine of ecstasy escaped her and numerous spasms shook her entire body. After a few long seconds, she fell back heavily into the bed, her breathing hoarse. Tears were even beading at the corners of her eyes. Now, she had just come.

It was with a smile that Omori withdrew her finger, before staring at it. It glistened with the most intimate fluids of her twin. A new idea came to her mind and slowly she brought it to her lips, licking it furtively. Sunny's eyes were initially half-closed, but they opened wide when she saw it.

“Omori, w—why did you lick it?! It's—”

“Disgusting?” She finished her question for her. “As disgusting as cumming while fingered by your little sister?”

And that hit her right in the chest.

She had just had sex with Omori—her twin.

Sunny's eyes filled with dread as the truth finally began to sink in.

Suddenly, she felt dirty. Dirty in a bad way. A surge of emotions began to flood her brain as she grabbed her arms and nearly curled up on the bed. She wanted to cry and didn't dare look Omori in the eyes anymore, but the latter was still staring at her.

She moved closer, and whispered a few words to her:

“You and I are both doomed, Sunny. Accept it,” she said. “We're both freaks. It's the truth.”

Notes:

i didn't plan for the ending to be like this but.....

kudos and comments are appreciated!