A Sibling’s Shadow (Worm)

A Sibling’s Shadow (Worm)

A/N: A Sibling's Shadow was a commissioned one shot originally written in March of 2021. Posting it up here and now for people to enjoy!

Summary: An AU where Sophia is Brian and Aisha's sister and she and Brian are in an incestuous relationship.

Themes: Threesome, Incest, Loving Sex

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"Eyes closed, Brian."

"I'm wearing a blindfold, Sophia."

"Still... no cheating."

Behind both the blindfold and his closed eyelids, Brian Laborn rolls his eyes. The young dark-skinned man sighs and remains where he is, seated in the chair with his hands gripping tightly at the arms. His sister, Sophia Laborn, had control issues. In all fairness, given her life experiences up to this point, it wasn't unexpected.

It was also probably the reason that they'd fallen in bed together. Brian was the only man in Sophia's life that she trusted, and while the young man had taken that to be because he couldn't BE sexual with her for the longest time, that had turned out not to be the case. The fact that they were brother and sister meant nothing to Sophia in that regard, and in the end the beautiful young woman had proven single-minded in her pursuit of his bed.

Ultimately, Brian had given in. Possibly because he loved his sister too much as well. Possibly because it was hard to take society's taboos about incest seriously when said society was literally crumbling to nothing around them. They were called Endbringers for a reason, even if no one seemed willing to acknowledge it. The End was nigh, and Brian wasn't going to let any old social convention keep him from making his sister happy.

Still, Sophia had control issues... while Brian absolutely HATED being restrained in any way, shape or form. In the end, they'd come to a compromise. Whenever Sophia asked it of him, he would wear the blindfold and keep his hands to himself until she said otherwise. No touching on his part, no looking... just feeling as Sophia effectively used him as a living dildo.

It wasn't a bad deal, and really, it wasn't all the time either. Plenty of the time, Sophia was willing to just let him have at her, moaning beneath him as he pinned her to the bed and fucked her silly. In fact, most of these blindfold times tended to end in that way as well.

Regardless, right now he was blindfolded and not allowed to do anything. And even this much was a little hard for Brian to handle, especially when his power let him see and hear where others could not. Having his senses freed... it was a big deal to him. All the same, he'd do anything for his younger sister, even this. And to be fair, the rewards were... quite good.

He feels the shift in weight in front of him just before hands grab his knees and pull them apart. Sophia unbuttons and unzips his pants carefully, cautiously, and then reaches into his boxers and pulls out his cock. He has to admit, she's not as... aggressive as he's used to, as her hands stroke up and down his growing shaft almost experimentally.

That's a little odd, given how long they've been in a sexual relationship. If she's planning something new and hasn't told him, Brian is going to be pissed. Communication is key, but Sophia can be an outright minx sometimes.

Tensing, Brian waits for the other shoe to drop. However, after a few moments of stroking him to near-full hardness, all he hears is soft panting as a pair of lips open up... and slide down the head of his member. Unable to help himself, the young man groans, tilting his head back and keeping his eyes closed beneath the blindfold. It never gets old, having his sister suck his cock.

Though, this doesn't feel normal either. Sophia is a lot surer of herself, usually. Usually, she's already taken him into her mouth and is busy trying to swallow his cock to the root like she's trying to prove something to someone, be it him or herself. This time however, she's taking her time, feeling him out, like she's never done this before, like she has no idea what she's doing-

It's then that Brian feels hot air on the nape of his neck. He very nearly freaks out, before familiar hands come down on his shoulders and a familiar voice hits his ear.

"I have a surprise for you, big brother~"

It's Sophia that's standing behind him. But Sophia is supposed to be on her knees, sucking his cock. Letting out a curse, Brian breaks his sister's rules and reaches up to yank the blindfold off. Blinking, he looks down and makes eye contact with his OTHER sister as Aisha Laborn bobs up and down the first part of his cock, slurping and slobbering at it with the inexperience of someone who's never done this before.

Brian stiffens as Sophia chuckles, wrapping her arms around his neck in a hug from behind and resting her chin on his shoulder.

"You like? Look how eager she is, Brian~"

As if spurred on by her big sister's words, Aisha begins to bob up and down on Brian's cock a little faster, causing him to groan as she makes up for inexperience with sheer enthusiasm and an obvious eagerness to please.

Brian... Brian was the oldest. But only by a couple years. Sophia was the middle child, one year under him. And then there was Aisha, the 'baby' of the family, but really only a couple years younger than him. Brian was a young adult, while Sophia and Aisha were still both in high school. That all said... he should have seen this coming from a mile away.

As if to echo his thoughts, Sophia chuckles again... and then passes through him, her power turning intangible as she slips her way through him and then drops to her knees beside their younger sister, becoming corporeal again as she places a hand on the back of Aisha's head and gently pushes her a little further down his cock.

Aisha begins to choke on his length at that point, her tight throat convulsing around the head of his member, but to her credit, she doesn't try to push back or resist it. She wants it, even, her eyes shining with desire as she lets Sophia lead her further.

"Then get on the bed."

Part of him is curious to see just how eager Aisha is. Part of him is curious to see how she decides to follow his order. In the end, he gets an answer to both questions quite fast. Eyes lighting up in excitement, his apparently VERY horny little sister hops up to her feet and climbs on the bed without a second thought. Naked as the day she was born, Aisha Laborn looks back over her shoulder at him... and waves her gorgeous, pert, ebony posterior in his direction, her glistening pussy lips visibly nestled between her thighs.

"I'm all ready for ya, big bro!"

Rising from the chair, with Sophia doing the same, the two siblings climb onto the bed together, with Brian taking up position behind Aisha, grabbing her hips firmly and digging his digits in just a touch roughly to gauge her reaction. Given her moan, Brian can see she's just like Sophia and not only doesn't mind a little pain but is actively happy with it.

Still, he hesitates, even as Sophia prowls around on all fours right beside them like a particularly tasty and gorgeous jungle cat.

"You sure about this, Aisha?"

With a groan, his youngest sister bumps her hips back into his crotch, while Sophia just snickers.

"I'm fucking sure, yeah! I've been ready for you for WEEKS, Brian! Now fuck me already, or I'll get Soph to do it with a strap-on or something!"

Brian likes to think it's an empty threat, but the way Sophia perks up makes it clear that she's not opposed to the idea... and that whatever Brian does here and now, Aisha is DEFINITELY getting that strap-on drilled into her later on. With a chuckle of his own and a loud sigh, Brian shakes his head... and lines up.

A moment later, he's inside of her. Taking it slow, he nevertheless breaks through Aisha's hymen and spreads her open around his massive cock in no time at all. Aisha just moans throatily, whimpering but clearly enjoying herself despite the pain. To be fair, she's incredibly wet already, almost as if she was prepared for this. Almost as if Sophia had very much 'prepared' her beforehand.

That much is all but confirmed when Sophia finally stops prowling and instead plops herself down right in front of Aisha's face, grabbing their younger sister by her hair as she gives her a grin.

"Time for some reciprocation, little sis. Go on... show me some love~"

Aisha has no problem whatsoever muff-diving Sophia as Brian fucks her from behind, and in no time at all, the youngest Laborn is being spit-roasted between her two older siblings. For his part, Brian speeds things up only as much as he's sure Aisha can stand. He's very big down there, his cock large for his age, and even with Sophia he'd had to take things slow at first so she could get used to him.

He does the same with Aisha, driving himself inside of her tight, slick folds only as fast and as hard as he dares, slowly but surely spreading her open on his cock, resizing her cunt to his massive, majestic member. Aisha would probably be a lot more vocal right now if it weren't for the carpet-munching she's doing for Sophia, judging by the muffled moans and squeals and screams as Sophia gasps and moans herself.

They make eye contact over their little sister's flexing, undulating body, him and Sophia, and she gives him a challenging grin, as if daring him to be unhappy with her for what she did. But Brian just shakes his head and answers her with a smile of his own, even as he tightens his grip on Aisha's hips and drives just a bit deeper into her with a bit faster thrusting.

Sophia was right. This was effectively destined to happen. He and Sophia had discovered Aisha's search history just the other day on the 'family' computer (it was more like the siblings' computer; their father wasn't tech savvy enough for the machine) and so they were both well aware that she'd been researching incest kinks and looking up all sorts of wank material. The worst was, she'd found some Shadow Stalker and Grue smut and after reading it, Sophia had insisted upon them acting it out, like they hadn't already engaged in plenty of public sex while in costume.

That really should have been a clue to Brian that something was up. He'd thought the search history was a precursor to his little sister's sexual awakening, but that was him being unable to realize Aisha was practically an adult in her own right at this point. Now, with more context, it was obvious she'd only been looking up incest because she'd caught him and Sophia going at it while using her power to hide from them.

It was one of the strongest Stranger Powers Brian had ever seen, but that was good in his eyes. It meant Aisha should be relatively safe, all things considered. She would almost certainly want to get in trouble, the same sort of trouble that he and Sophia got in all the time. At least her power would protect her, even if it would also keep him from keeping her out of danger.

In the meantime, it seemed that his incestuous, taboo relationship with one sister had ballooned into a three-way with the other. And frankly, as Brian drives himself deeply into Aisha and cums inside of her, setting off a cascading effect that causes both her AND Sophia to reach explosive orgasms as well... he can't bring himself to mind all that much.

His sisters are happy, and in Brian's eyes, that's all that matters.

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