Furtum Corpus Familiae, Book 2 - Cover

Furtum Corpus Familiae, Book 2

by Krosis of the Collective

Copyright© 2025 by Krosis of the Collective

Supernatural Sex Story: A young man wakes up to find himself in his sister's body.

Caution: This Supernatural Sex Story contains strong sexual content, including Ma/Fa   Consensual   Reluctant   Romantic   Gay   Heterosexual   TransGender   Magic   Cheating   Black Male   White Female   Anal Sex   Double Penetration   Oral Sex   Pregnancy   Sex Toys   Caution   .

Red opened his eyes. Where was he? The room looked familiar. He was sitting on a tall stool at an island in the middle of an open concept kitchen. Was this his sister’s place? He stepped off the stool, landed awkwardly on his foot, and fell to the tiled floor. “Ow!” How had that happened? It was like his legs weren’t as long as he remembered ... and what was with his voice? He looked down. Boobs ... he had boobs, poking out the tight, white t-shirt he was wearing. He sat back to see pale legs under a pair of lacy red panties, and the sheer underwear made it obvious: his dick! It was gone! “Shit!” His voice was definitely too high.

“Babe, you okay?”

Red turned to see his twin sister’s boyfriend Neil step into the room, the handsome man’s mocha-skinned features showing concern as he rushed forward.

“Scar, babe ... you hurt?”

“Why ... why are you calling me Scar?” Scarlet was his sister’s name. Yes, their parents had named their twin kids Red and Scarlet.

Neil knelt and pushed Red’s hair back ... except the hair was too long. “‘Cause that’s your name ... you hit your head?” He tentatively felt about Red’s skull for a goose egg.

Red took a breath and noted that Neil smelled really good. He’d always had a crush on the guy, with those blue eyes making him look like that doctor on Grey’s Anatomy, but of course Neil was as straight as an arrow, and with his sister besides, so nothing was ever going to happen there. “Just ... landed on my foot funny.” He pushed himself to his feet ... no, his sister’s feet, he realized. Somehow he was his sister now. After making sure he hadn’t sprained his -- her -- ankle, he grabbed her phone, which immediately unlocked as the camera beheld her face, and opened the photo app to confirm ... yes, his sister looked back at him from the screen, her pretty features framed by her shoulder-length auburn hair. Suddenly everything darkened and went sideways.

“Scar!”


Red was walking along a lonely road, the fjords off in the distance and the cold air ever-present on the little exposed skin showing through his layers. He was feeling good, the miles he’d already walked having loosened his lean muscles, but it was getting late and a car would be welcome...

He heard the motor and turned, sticking his thumb out in the universal sign, and smiled as the black van pulled up, but it didn’t last ... men, wearing full head covers and dark clothing to match the van, jumped out and grabbed him, throwing him into the vehicle as one of them shoved something into his face. There was a hiss...


Red opened his eyes. He was in bed ... the window was open, allowing a little breeze to come through. It was still daytime, not evening ... hadn’t it been getting late? He shook his head and felt his sister’s long hair tickle his cheek. He sat up, once again goggling at his sister’s C-cup boobs sticking out from his/her chest.

“Hey, hey ... don’t move too fast.”

Red turned to see Neil kneeling next to him.

“Do you know where you are?” the handsome man asked.

“Scar’s apartment.”

Our apartment.”

“Yeah, yours and Scarlet’s.”

Neil’s brows knit in concern. “I had a close look, and it doesn’t seem like you hit your head, but you sound ... well, not yourself, babe.”

Red started as Neil took Scarlet’s hand. “I, uh, I’m not ... I’m...” Then he thought about what he should say. ‘I’m really my brother Red?’ Neil was already looking at him ... her ... like his girlfriend was either concussed or going crazy. He thought back to the dream he’d just been having. Was it a dream, or a recollection? “I’m concerned about my brother ... where’s my phone?” Neil pointed to the side table and Red grabbed it, phoning his own phone, but of course there was no answer; in fact, it went straight to voicemail, so it was off. He used the web browser to search for the police number nearest to where he’d been kidnapped. Using the limited Norwegian he’d picked up in his travels, he spoke to the authorities there and was able to impart that his brother had gone missing. After getting transferred a couple times, an English speaker there took the report, including information on the stretch of road he’d been on, and told him they’d be in touch.

“You got that twin sense, huh?” Neil asked, looking concerned.

“Uh, yeah.”

“And you know Norwegian?”

Red shrugged. “Duolingo.”

“You gonna be okay? I can stick around instead of going grocery shopping ... or do you wanna come with?”

“I, uh ... think I need some rest.”

“Okay ... I’ll be back soon ... love you, babe.” Neil leaned in and gave his girlfriend a kiss on the forehead.

Red was glad he didn’t go for her lips. “Yeah ... you too.” Then the man was gone. Red lay back and looked down at his sister’s body again. She wasn’t wearing a bra so her nipples were sticking out through the cotton t-shirt, the cool breeze hardening them a little as it wafted through the window. As a gay man, Red had no interest in breasts, but he took them in his hands to confirm that this was, indeed, real. Squishy. He pulled up her shirt to reveal her sheer, red panties to verify that the seven-inch manhood that he’d been so happy with for many of his 24 years was gone. How the hell had this happened? After those guys in the van grabbed him, everything was blurry and vague.

He rolled out of bed and almost fell over at the difference in balance, his sister being shorter and top-heavy in comparison. His ankle was a little sore, but he could walk. No, his sister’s ankle. He sighed. This was too confusing ... for as long as he was in his sister’s body, he would think of it as his body, even if it was just temporary. He really fucking hoped it was temporary. He had breasts and a vagina, long hair and a higher voice. So ... fucking ... weird.

And there was nobody else he could call ... Scarlet was his only family after their parents died a few years ago. He hoped the Norwegian police found him soon but there wasn’t much to go off of. He searched the web for causes of consciousness transfer but mostly found bad erotica which made him feel weird between his legs, kind of like an erection but less specific ... also moist.

When Neil got back, Red went to greet him ... he decided that he’d have to pretend to be his sister for now or he’d probably get thrown into the psych ward. This seemed like magic, though that was crazy ... however, crazy was his life now, apparently. Who knew magic? Maybe he could go visit a fortune teller? He helped put away the groceries, sticking to the stuff that would go into the fridge and freezer because he didn’t know where everything went in the cupboards, but the cold air made his nipples hard again, which did not go unnoticed. Red gasped as he felt Neil’s warm hands on his breasts from behind.

“You feeling better?” Neil asked as he pressed his hard member into Red’s butt.

Though in his sister’s body, a hard cock pressing into his butt was always a signal for ‘go time’. “Mm,” he moaned as he pushed back at it, but then caught himself. “I, uh ... we shouldn’t.”

“Shouldn’t? Your period ended a few days ago, didn’t it?” He squeezed her breasts again, his fingers finding her hard nipples and giving them a light tweak.

“Unh,” Red grunted as his borrowed pussy sparked at the strange pleasure coming from his nipples. His own body’s nipples were too sensitive to enjoy this kind of attention, so this was novel. “I ... uhh ... I’m still worried about Red.”

“I’ll take your mind off it for a bit?” Neil nibbled her ear.

Shit. “Um ... later?” Red knew if Neil pressed any harder for sex that he wouldn’t be able to keep from fucking his sister’s boyfriend. He felt a kiss on the back of his neck and shuddered.

“Okay, babe. You wanna watch some TV?” Neil moved back, though he kept his hands on Red’s shoulders.

“Yeah ... yeah.”


Red put on some sweatpants in order to keep his sister’s goods hidden, lest Neil get some ideas as they cuddled on the couch. They watched some Three Body Problem, though Red had seen it before.

“You bored, babe? You didn’t watch ahead, did you?” Neil asked.

“Um ... sorry ... yeah, I did.”

Neil pulled back. “We agreed we weren’t gonna do that anymore.”

“I, uh ... sorry, Neil. I ... I’m tired ... I should go to bed.” Red got up and did just that, the weirdest part peeing with a vagina but the second-weirdest was flossing his sister’s teeth ... there’s just some things that you get used to about your own body. Then, after taking off his sweatpants but keeping his t-shirt and panties on, he got under the covers and closed his eyes.


Red opened his eyes to find himself restrained on a gurney like at a hospital, but the room was dim except for the light directly overhead. “Whuzzgoinon’?” He shook his body and felt something shift around his neck, but couldn’t see what it was.

“Subject is awake,” someone called out over an intercom.

Someone came alongside him. “Red? Red, I need you to say these words and we’ll free you, okay?” The man held up a card with big letters.

“Furtum ... corpus ... famil ... uh...”

“Familiae.” Pronounced ‘fa-mee-lee-eye’.

“Where am I?” Red’s head was fuzzy, like when he’d taken too long of a toke.

“C’mon, Red ... say it, and we’ll let you go.”

“Furtum corpus familiae.”


Red woke, realizing that his dream had been another memory. He’d said those words and then found himself in his sister’s body! Then he realized that Neil was molesting that borrowed body while he slept and moaned as the man’s skillful fingers slipped into his sister’s very wet pussy. It felt so fucking weird to have a hole where previously there’d been a substantial prong of meat jutting out. “Ohh...”

“So hot for you, baby,” Neil moaned into Red’s ear as his fingers found Scarlet’s clitoris.

“Oh shiiit...” Red groaned. It was like having his cock stroked but more intense. Neil was also kissing his neck, another of his weaknesses. He felt his sister’s boyfriend’s hard cock slip between his thighs and knew he wasn’t going to be able to deny him. He opened his legs, felt his panties being pulled aside, and then the tip of Neil’s cock was poking away down there. He almost reached down to direct it to his butthole out of habit, but then it started to press between his pussy lips. “Oh.” The tip popped inside. “Oh!” It felt so weird, and yet amazing. “Oh shit...”

“Mm, you’re so wet, baby...” Neil slipped half of his sizable cock inside before pulling back to get a better angle ... then all of him slipped inside.

“Uhrghl...” Red gurgled in pleasure as he felt a man’s hard length tap at his borrowed cervix for the first time. Then he gasped as Neil retreated and pushed back in. It was similar to anal sex but Red quickly realized that the pleasure receptors along vaginal walls were more ... not intense ... what? Subtle? Anal insertion was sometimes a combination of discomfort and pleasure, a balancing act to keep things feeling good while fighting the anus’ instinct to rebel against an insistent intruder. His vagina, however, welcomed Neil’s cock, like it was made for the man, and given that his sister had been with him for years, that made sense. Her body was simpatico with Neil’s, like an old pair of jeans that hugged your ass perfectly. “Unhh!” He felt something growing from deep inside his sister’s body where Neil’s cock delved the deepest. “Fuuuck...”

Neil reached around to play with Scarlet’s clit again. “C’mon, baby, cum for me...”

“Ngh! Ohhfuck! OHHSHIIITT!” Red came hard from his sister’s clit and cervix at the same time as Neil’s cock pounded into him from behind.

“Yesss ... oh, you’re making me cum...” Neil moaned into Red’s ear.

“Hhnngghhh!” Red grunted as he felt Neil’s cock throb deep inside, the sensation of the warm liquid pressure extending his orgasm. “Fuuuuck...”

“Mm! So good, baby,” Neil whispered into Red’s ear.

“Nhgh! Ngh!” Red’s borrowed body continued to shake with afterorgasms, his sister’s vagina urging the last drops of her man’s cum to drip inside her.

They lay there for a bit until Neil’s dwindling penis slipped out, and then both fell asleep, still entwined.


Red woke to the sound of his sister’s phone blaring. It wasn’t a phone call, but an alarm indicating that he should get up. “Ugh,” he grunted as he hit the snooze button. When Neil’s phone started doing the same a few minutes later, also snoozed, Red pulled the covers off of them and grabbed Neil’s limp penis.

“Uh, babe, we gotta get to work.”

“This won’t take long,” Red told him as he felt the man’s member hardening. He didn’t get a chance to see it last night, but it was thicker than the one on his own male body. Once it reached its full 7-inch length, he took it into his mouth.

Neil smiled down at Red. “A blowjob? What’s the special occasioooohh holy shit, Scar, where’d you learn...? Oh wow...”

Red smiled around Neil’s man-meat. If there was one thing a gay man did well, it was fellatio, because he knows exactly what works on his own cock. He made sure to tongue the frenulum when pulling up, and then taking the tip right into his sister’s throat a little when diving back down, swallowing to produce sensations that a heterosexual man was unlikely to have ever felt. His sister’s throat rebelled a little ... he’d have to work on that ... he’d suppressed his own body’s gag reflex long ago.

 
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