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Muscle Growth

When your muscles are growing bigger. Especially relevant if the character doesn’t have much musculature to start with. This can involve muscles being grown conventionally (i.e., hard work at the gym), but usually there’s something more going on that gives the growth a push.

Compare Muscle, which can be just about having big muscles, and Size Growth, which involves getting bigger overall.

Kinds of “Muscle Growth” stories include:

Other tags that also fall under the category “Muscle/Strength”: Hyper Strength, Muscle Breast, Muscle Theft, Muscles.

Stories found: 857.

Something missing? We’re always looking to improve the way our stories are tagged. If you know of a story that should be added to this page, please go to the story page and use the tag suggestion feature—the link is directly under the list of tags.

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Complete story list for Muscle Growth:

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  • A.I. by Corwin(11 parts)AI Andr Cock Mind MGrow Musc Bond  Tim’s homemade A.I. software decides to help him get huge.  Added Dec 2013  •  30.6K words
    33,856 views
  • Above average by Ziel(28 parts)CGrow Cock HyCock Cum HMusc MGrow Musc Retcon  Alan starts out as just your average college boy. Then a strange, magical artifact comes into his life, and he starts becoming bigger… almost remembering the ways things were, when his muscles and cock weren’t, with each orgasm, more and more above average. As the effects spread, Alan knows he must understand what’s happing to him and his friends—and also that he must be the biggest, most muscular, most hypercocked stud of all.  Added Apr 2013  •  Updated Dec 2018  •  130.4K words
    199,231 views
  • The accidental wizard by nolanspice(2 parts)AgeDown MGrow Musc PSD Rep Grow Tf    Added Jan 2006  •  2.9K words
    16,567 views
  • The acolytes by Richard Jasper(7 parts)CGrow Hair Taller Cock HyCock HMusc Strong MGrow Musc Grow  It all started with an arm-wrestling contest. Blond surfer god Mike Schnelling, 5’10”, 175 lbs., wanted to take me on. Which was fine but I had 50 lbs. on him, all muscle. We never could have imagined how it would all turn out!  Added Aug 2020  •  8.1K words
    3,601 views
  • Acting out by Cris Kane(3 parts)CGrow Cock MGrow Musc  A straight actor preparing to audition for a gay role receives help getting into character from his gay friend and a couple of magic rings, but their mind-altering effects lead to unexpected outcomes for Quinn and Damon alike.  Added Aug 2014  •  24.6K words
    23,836 views
  • Ad man by FanTCMan  CGrow Hair Cock HyCock Cum Infect MGrow Musc Nonc 2Gay    Added Dec 2003  •  8.6K words
    56,428 views
  • Adam’s first growth spurt by MDS  Bro Giant Cock MGrow Musc Grow  Adam comes home from a day of being bullied at school to find he definitely won't have to worry about anything like that after today.  Added Nov 2016  •  2.4K words
    31,539 views
  • Addiction by Hatman  Cock MGrow PSD    Added May 2010  •  1.9K words
    20,901 views
  • Administrator by FanTCMan  CGrow Dumb Cock MGrow Musc    Added Apr 2003  •  1.8K words
    20,448 views
  • Admiring the changes by Josh Barrett  MGrow Musc  After months of hardly any progress at the gym, Alex finds a strange stone that makes him into what he’s always wanted to be.  Added Jun 2014  •  2.0K words
    21,559 views
  • The adventures of Rex by Richard Jasper(6 parts)CGrow Demons Fant Cock MGrow Musc Ogres Race Grow Tf Series  MLB Player Rex Chastain is dragooned into the service of a wizard but a magical transformation goes somewhat awry.  Added Feb 2020  •  3.9K words
    3,973 views
  • Aftermath by Richard Jasper  MGrow Musc  Recently widowed, Roger decides to join the gym and get big.  Added Jan 2020  •  Updated Feb 2020  •  3.9K words
    3,567 views
  • Against protocol by BRK  CGrow Dig Cock Cum XArm XLimb MGrow  The mods they give to MetaMorph’s in-house scientists to beta-test are supposed to wear off after two weeks, but Jackson’s mods are inexplicably persistent… and they’re starting to pile up.  Added Nov 2019  •  2.4K words
    3,769 views
  • Ah! my god by Josh Arima  Infl MGrow Musc    Added Jun 2005  •  4.3K words
    25,635 views
  • Airport muscle by Richard Jasper(5 parts)CGrow Cock MGrow Musc Shift Tf  When you have a really long layover, having a sleeping cube comes in handy!  Added Jan 2020  •  Updated Feb 2020  •  5.9K words
    4,856 views
  • Aisle 13 by Richard Jasper(7 parts)MGrow Musc  A random encounter at the grocery store prompts big Jake to recruit a passel of wannabe muscleboys.  Added Jan 2020  •  Updated Feb 2020  •  8.3K words
    3,184 views
  • Alex by Jcry123  Cock MGrow Musc  A young guy decides to try out a gift from a random stranger that might making him bigger.  Added Nov 2011  •  1.5K words
    29,089 views
  • Alex in Wonderland by Anarchy A(3 parts)CGrow Balls Cock HyCock Cum HMusc MGrow Musc Shr Grow  Alex follows mysterious man into a forest, and quickly finds himself in a strange new world, deep below the ground.  Added Jan 2016  •  Updated Apr 2017  •  6.2K words
    34,044 views
  • Alien implants (revised) by WordShop(2 parts)CGrow Hair Cock MGrow Musc Symb  Three twenty-year-old military brats have a close encounter that leaves behind unexpected surprises for them all. How do three young guys deal with something that they cannot even begin to explain or understand? Not to mention the very strange dreams…  Added Nov 2017  •  3.1K words
    15,599 views
  • Alien tormentors by James Fourlegs  Alien Cock XArm XCock XLeg XLimb MGrow Musc Rep  Unseen aliens juice the daylights out of their captives.  Added Dec 2004  •  1.0K words
    17,317 views
  • All good things by Anon Amon(100 parts)Bro CGrow CumInf Balls Cock HyCock Cum Immob Infect MGrow Musc NipCum 2Gay Twins  After the discovery of an ancient artifact, life is changed forever for a group of college students who have bigger things to worry about than getting ready to start classes.  Added Feb 2017  •  Updated Aug 2019  •  115.4K words
    137,505 views
  • All or nothing by Double-U  MGrow Musc Grow  Take a step into Allan Rader’s thoughts and explore a strange new casino that hasn’t opened up to the public yet. Will Allan get some BIG returns?  Added Sep 2016  •  2.2K words
    10,069 views
  • All your wildest dreams by FloralSpaded(2 parts)CGrow Cock Infect MGrow Musc  When Walker has his hot friend Joe over for the night, things get out of hand and all of Walker’s wildest dreams come true.  Added Jun 2018  •  1.5K words
    11,047 views
  • Alpha by CharitysSongbird  Fur CGrow Dom Taller Balls Cock HyCock MGrow Musc Self Grow Tf Were  Used to being smaller than his office mates, especially his crush Tavy, Ritzy is stunned when he suddenly starts getting bigger and furrier, even as the impulse to dominate seeps into his personality.  Added Aug 2018  •  14.3K words
    24,261 views
  • Alpha House by NBCK99(3 parts)CGrow Cock Pher MGrow Musc  A collection of young guys take part in a reality series where the action includes everyone spinning a wheel and getting random body changes.  Added Mar 2015  •  Updated May 2015  •  11.9K words
    47,724 views
  • Alpha Luke and the wrestling team by Eric Aaldersen  CGrow Grad Balls Cock Cum Pher Strong MGrow Musc Supn Series  Luke finds another beta mate on his wrestling team and his sexual energy infects the whole team during a special match!  Added Aug 2020  •  6.9K words
    2,652 views
  • Alpha Luke grows his circle by Eric Aaldersen  Bro Balls Cock MGrow Musc Supn Series  Now fully aware of his alphahood, Luke breeds some more betas hoping to make Brian an alpha like him. Luke and Mike finally bond as they were meant to.  Added Mar 2020  •  9.0K words
    4,313 views
  • Alpha Luke passes on the lore by Eric Aaldersen  CGrow Grad Balls Cock MGrow Musc Supn Series  Luke and Brian’s story finally reaches its climax and afterwards things get positively mystical.  Added May 2020  •  4.9K words
    2,111 views
  • Alpha male by Josef Howard(5 parts)MGrow Musc Super  A gay man wakes one morning inside the body of the (formerly) straight star-spangled super-hero AlphaMale. Everything is terrific until AlphaMale’s studly sidekick finds out his body is inhabited by an imposter.  Added Jul 2002  •  15.1K words
    31,488 views
  • Alpha master god king by MaleHypnoDomination and Mr. GreyMan  Dom Mind MGrow Musc  An unassuming househusband accidentally becomes the God-King of the world.  Added May 2016  •  7.6K words
    17,574 views
  • Alpha Mike and his alpha bro by Eric Aaldersen  Bro CGrow Grad Balls Cock MGrow Musc Supn Series  Meet Alpha Mike, Luke’s older brother, on the day that he discovers that his little bro is an alpha, too!  Added Mar 2020  •  5.4K words
    4,503 views
  • Alpha product series by Chet Boner(18 parts)AgeDiff Bro CGrow Dad Balls Cum MGrow Musc NipCum Images  19-year-old Trent accepts a free trial product series called “Alpha Product” in exchange for his feedback. He receives the first product very quickly, but doesn’t know how many people would be affected and grow as a result of this choice!  Added May 2017  •  Updated May 2019  •  22.7K words
    56,319 views
  • The Alpha by Ziel  Fur Hair Cock 2Anim MGrow Musc Nonc Tf  Harrison’s chance encounter with the creature that has been stalking the campus changes him in ways he’d never thought possible.  Added Dec 2017  •  4.1K words
    14,950 views
  • Altered by Dream Big(5 parts)CGrow Hair Taller Cock 2Anim Pher MGrow Musc Nonc Bond Grow  Chris wakes up in a strange laboratory, only to learn he’s one of a number of subjects in a mysterious program that involves alterations to the male human body. At least the guy they have looking after him seems sympathetic… and very, very sexy.  Added Jan 2020  •  Updated May 2020  •  9.5K words
    11,603 views
  • Amplifications by Also Known As(5 parts)Cock MGrow Musc Grow Series    Added Jan 2014  •  22.6K words
    18,448 views
  • And then he came by Teen Hulk(2 parts)CGrow Virgin Cock Cum Infect MGrow Musc Self  David's dream is interrupted … but only until his next visit to the gym.  Added May 2002  •  7.4K words
    33,287 views
  • Andy finds Cockr gives and takes away by Clearlyhere(5 parts)CGrow CShr Dom Cock MusBr MGrow Musc Series  Andy has mixed feelings about his experience with the Cockr App. He discusses it with his friend Bill. Bill comes up with a plan that is mutually beneficial.  Added Oct 2017  •  Updated Jun 2019  •  14.0K words
    23,619 views
  • Angelo and Adrian by WordShop(8 parts)CGrow Grad Pher Infect MGrow Musc  Genius Angelo and sweet Adrian are both scarred by their pasts. Angelo has to accept change in his life, and accidentally, without intending it, Adrian is forced to accept a new life for which he is not at all prepared.  Added Oct 2017  •  Updated May 2018  •  42.9K words
    19,120 views
  • Another nerd story by Sithspawn(2 parts)CGrow Taller Cock Strong MGrow Musc Nano Grow  Ollie is your typical nerd who asks his neighbour for help dealing with the local bully. Tom offers some advice that leads to an encounter he'll never forget.  Added Apr 2020  •  Updated May 2020  •  9.1K words
    6,505 views
  • Anything to grow by Big Bull Trainer  Dumb Immob MGrow Musc Grow Tf  There are some with an unquenchable desire to not only grow, but to grow to unnaturally large proportions, and will go to any lengths to do it. This is a story of just such a person.  Added Aug 2016  •  7.8K words
    30,962 views
  • The apartment by BRK  CGrow Taller Cock Mental MGrow Retcon  Sometimes what you need in a new apartment has more to do with what’s missing in your life.  Added Apr 2020  •  3.4K words
    4,767 views
  • An app for the ages by Seth Peterson  Fem CGrow Dumb Hair Taller Cock MusBr MGrow Musc Nonc  An app that can change people on a whim? A totally ego-maniacal straight boy with a strong distaste toward his nerdy, unappreciative roommate? Well, things can only get more exciting from here, can’t they?  Added Dec 2018  •  3.1K words
    15,578 views
  • The application by SuperWaffle(8 parts)Fur MGrow Musc Grow  A powerful story in which an anthro fox named Bradley learns that a body-morphing app is a wondrous, life-changing thing for himself and for new friends as well—if it doesn’t fall into the wrong hands, that is.  Added Apr 2015  •  44.5K words
    35,553 views
  • Are you sure by Dream Big(5 parts)Bi CGrow Taller Het Balls Cock Cum MGrow Musc Race Self Grow  Suddenly awash with money, Bill takes the plunge and follows the stories of secretly augmented men and women to a remote lab where they promise to fix everything he doesn’t like about his body.  Added Nov 2019  •  6.2K words
    6,553 views
  • The Arsenal of Secrets by BRK(10 parts)CGrow Fant Taller Cock XAbs XArm XLimb MGrow Grow Tf Series  Griffin, tired of being smaller than his farm-brute brothers, stumbles backwards into a way to make himself more like what he wants to be: big and strong enough to catch the eye of a beautiful, bashful, broad-shouldered apprentice blacksmith named Wass.  Added Aug 2020  •  25.8K words
    2,547 views
  • At the cafeteria by BRK(3 parts)CGrow Cock Immort Infect XCock MGrow Musc Sugg  Jordan meets up with his friends at the cafeteria very late one night before midterms. They end up making a game of passing around Ethan’s ancient-recipe birthday liqueur and telling strange rumors about each other, with some unintended consequences.  Added Jun 2015  •  8.4K words
    22,560 views
  • Attil|a|rt by LAComplex  CGrow Viol Taller Giant Cock MGrow Musc Grow  The 15-foot phenomenon Attila pays a visit to the world-famous Michelangelo’s David statue, having decided to offer to the world a new reference for manliness and virility.  Added Mar 2019  •  7.0K words
    5,836 views
  • Augmentations by Also Known As(18 parts)CGrow Cock Scent MGrow Musc Grow Series  Pursuing a fantasy, a successful man hires an erotic partner who’s been augmented, but the kinds of pleasures his new lover can share with him are far beyond anything he’d imagined.  Added Jan 2014  •  98.8K words
    31,513 views
  • The awakening (muscl4life) by muscl4life(2 parts)CGrow Fant Cock MGrow Musc    Added Nov 2013  •  Updated Dec 2013  •  10.3K words
    14,549 views
  • Away game by spacevlad(2 parts)MGrow Gut Musc PSD Grow  College freshman Adam is the smallest guy on the football team. On an away game road trip, he gets paired up to room with Wyatt, the biggest offensive lineman on the team. Adam tries to control himself as they are forced to share a bed, but Wyatt’s massive body is hard to resist.  Added Dec 2017  •  6.3K words
    18,092 views
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