1 Grown to be used by Hairymusclemorphs Crushing on a dream man on the subway can take a jarring turn when the muscle beast notices your dark desire. 8 parts 10k words Added May 2025 Updated 24 May 2025 15k views 4.8 stars (37 votes) No comments yet •Cock Growth•Huge Balls•Ball Growth•Hyper Cock•Muscle Growth•Man Scent•Increased Libido•Voice Deepening•Getting Taller•Hair Growth/Getting Hairy•Dom/Sub •M/M

2 Adonivirus by Jay Two college students have diverging reactions after being exposed to a rare pathogen with the power to transform their bodies. 3 parts 9,447 words Added May 2025 Updated 31 May 2025 9,254 views 4.9 stars (23 votes) No comments yet •Cock Growth•Muscle Growth•Muscle/Strength•Increased Libido•Gradual Change •M/M

3 Dicks keep growing around me by body beyond Until recently, Myron has been oblivious to the fact that dicks would get mysteriously bigger the longer someone hung out with him. He begins putting the pieces together as his boss, Miguel, and roommate, Ty, start going through all too familiar changes below the belt. 4 parts 15k words Added May 2025 Updated 31 May 2025 8,314 views 4.9 stars (17 votes) No comments yet •Cock Growth•Huge Cock•Hyper Cock•Self-suck•Muscle Growth•Butt Growth•Gradual Change•Getting Taller •M/M•M/M/M

4 The rescue by InflatedMuscle Expert hunter Chaz encounters a mysterious beast in the deep words—a beast with two legs. 10 parts 113k words (#20) Added Mar 2025 Updated 17 May 2025 21k views 4.7 stars (26 votes) No comments yet •Cock Growth•Huge Balls•Ball Growth•Huge Cock•Hyper Cock•Cum Milking•Hyper Cum•Addiction•Hyper Muscle•Immobility•Muscle Growth•Muscle Gut•Man Scent•Butt Growth•Belly Growth•Feeding•Increased Libido•Foot Growth•Voice Deepening•Getting Taller•Forced Growth•Plausible Size Difference•Size Decrease•Size Increase•Hair Growth/Getting Hairy•Inflation•Cock Cage•Nonconsensual change•Restraints•Sex-Slave•Dildos/Toys•Horror •M/M

5 The dudes by BRK The guys at school are really susceptible to suggestion—so much so that if you tell them something’s true, it turns out that it actually is true. (Slightly revised throughout as of May 2025.) 8 parts 22k words Added Mar 2010 Updated 17 May 2025 144k views 4.7 stars (59 votes) No comments yet •Always Hard•Cock Growth•Huge Balls•Ball Growth•Huge Cock•Self-suck•Hyper Cum•Public Orgasm•Multi-abs•Straight to Gay•Muscle Growth•Muscle/Strength•Public Nudity•Increased Libido•Getting Handsomer•Getting Taller•Plausible Size Difference•Size Increase•Tongue Growth•Retcon•Suggestion•Incest•Brothers•Hyper Pheromones •M/M•M/M/M•M/M/M/...

6 Cum dosing by BRK Mark’s hunky roommate, Aaron, is dead set on getting bigger, and Mark has a vested interest in making it happen. 3 parts 16k words Added Mar 2025 Updated 31 May 2025 16k views 5.0 stars (40 votes) No comments yet •Cock Growth•Ball Growth•Huge Cock•Self-suck•Hyper Cum•Straight to Gay•Muscle Growth•Muscle/Strength•Gradual Change•Size Increase •M/M

7 The breeder by YngBullRider David and Marcus are a perfectly ordinary couple, until they are taken for experiments that push the limits of masculinity. 2,147 words Added May 2025 5,346 views 3.9 stars (8 votes) No comments yet •Cock Growth•Ball Growth•Cum inflation•Muscle Growth•Male Pregnancy•Forced Growth•Complete •M/M

8 Equivalent exchange by Dream Big The universe has strange ways of evening things out, as tall, innocent theater major Zach comes to discover after meeting his future boyfriend, Will. 3 parts 6,572 words Added May 2025 Updated 17 May 2025 6,054 views 5.0 stars (10 votes) No comments yet •Cock Growth•Huge Cock•Self-suck•Muscle Growth•Getting Taller•Size Decrease•Size Increase •M/M

9 The procedure by screamingmoist A young man wants a better body, but “better” is all a matter of perspective. 3,240 words Added May 2025 4,147 views 4.3 stars (3 votes) No comments yet •Cock Growth•Straight to Gay•Muscle Growth•Complete •M/M

10 Best self by BRK “Viral video” doesn’t always mean what you think it means. 2 parts 4,420 words Added Apr 2025 Updated 24 May 2025 8,713 views 4.6 stars (8 votes) No comments yet •Cock Growth•Huge Cock•Other Mental Changes•Straight to Gay•Muscle Growth•Always Shirtless•Getting Handsomer•Getting Taller•Retcon•Nonconsensual change•Shapeshifting •M•M/M

11 Justin (the bigger the better) by Giant Worshipper A young man starts growing, and growing. He finds he likes it a lot. 15 parts 99k words (#28) Added Nov 2009 477k views 4.3 stars (93 votes) No comments yet •Cock Growth•Huge Cock•Hyper Cock•Straight to Gay•Hyper Strength•Muscle Breast•Muscle Growth•Muscle Gut•Muscle/Strength•Muscle Worship•Man Scent•Increased Libido•Getting Taller•Giants•Size Increase•First Time/Virgin

12 An evolving look by West A shy stud gets his night (and coming days) turned upside down when his cocky best bud frantically knocks on his door. While the two spend time together, something big is growing within one of them. 2,781 words Added May 2025 3,157 views 5.0 stars (4 votes) No comments yet •Cock Growth•Huge Balls•Huge Cock•Hyper Cock•Muscle Growth•Getting Taller•Forced Growth•Complete •M/M

13 Sheepish Sean by johnnyacolin Shy college freshman Sean gets a growth spurt that’s alarming enough to pay a visit to the doctor. 8 parts 12k words Added Nov 2021 Updated 10 May 2025 28k views 4.8 stars (51 votes) No comments yet •Cock Growth•Huge Cock•Father/Son•Lycra/Spandex•Stories with Images •M

14 Cursed warehouse by Dace Levi and his friends wake up with crushing hangovers in a strange warehouse full of cursed items. They have to play some sort of sick game if they ever want to get out—but what does it even mean to be cursed, down here? 10k words Added May 2025 3,065 views 4.4 stars (8 votes) No comments yet •Always Hard•Cock Growth•Straight to Gay•Muscle Growth•Nonconsensual change •M/M•M/M/M/...

15 And the devil laughs by MaxMorphs A story about a hung athlete who doesn’t know when to stop. 7 parts 13k words Added Jan 2025 Updated 31 May 2025 19k views 4.8 stars (34 votes) No comments yet •Cock Growth•Cock Shrinking•Huge Cock•Muscle Growth•Hair Growth/Getting Hairy •M/M

16 Avilus by Bottoming James, a horny, gay senior, comes across a reality-altering device. Who will it change—his friends, his bullies, even his annoying, muscle-bound brother Zack? 2,304 words Added May 2025 2,870 views 4.3 stars (7 votes) No comments yet •Cock Growth•Ball Growth•Female to Male•Straight to Gay•Muscle Growth•Butt Growth•Hyper Anus•Increased Libido•Getting Handsomer•Gradual Change•Transformation•Voice Deepening•Getting Taller•Hairless•Incest•Brothers•Dom/Sub•Nonconsensual change•Mind Control •M•M/M

17 Bodychanger by Dace Gage has a particular set of skills, even for a sex worker. Tonight he's set to service José, a man who wants a more masculine body, a right-sized cock, and a few other tune-ups. The fact that José is straight doesn't matter: he'll pay to have Gage give him what he needs. 6,310 words Added May 2025 2,859 views 5.0 stars (8 votes) No comments yet •Cock Growth•Huge Cock•Muscle Theft•Transformation•Hair Growth/Getting Hairy•Shapeshifting •M/M

18 Egregious Fantasy by BRK Seth lives a normal life in a humdrum world, until he happens to run into a guy who in every way surpasses anything he’s ever dreamt of. 5,936 words Added May 2025 2,594 views 5.0 stars (5 votes) No comments yet •Huge Cock•Hyper Cum•Pec Fucking•Muscle/Strength•Muscle Worship•Plausible Size Difference •M/M

19 Body and mind by BRK Exasperated by college, work, and home life, Barry stumbles across an obscure app that might at least help make his insufferable, annoyingly sexy older brother Vince a tad easier to live with. 7 parts 39k words Added Nov 2024 Updated 3 May 2025 23k views 4.7 stars (41 votes) No comments yet •Always Hard•Cock Growth•Huge Cock•Self-suck•Public Orgasm•Replication•Other Mental Changes•Straight to Gay•Muscle Growth•Muscle/Strength•Always Shirtless•Increased Libido•Getting Handsomer•App•Retcon•Suggestion•Incest•Brothers•Nonconsensual change•Hypnosis•Mind Control •M/M•M/M/M•M/M/M/...

20 Alien Vector by Dace Ezar gets by in life by avoiding attention, and especially by avoiding his bully stepbrother and abusive stepfather. One night in the forest changes that when a meteorite breaks apart nearby when he’s on the run from a gang. His next encounter with his stepbrother Carter leads in a very unexpected direction. 5,677 words Added May 2025 2,554 views 5.0 stars (9 votes) No comments yet •Cock Growth•Addiction•Straight to Gay•Muscle Growth•Transformation•Incest•Brothers•Dom/Sub•Sex-Slave•Hyper Pheromones•Aliens•Symbiotes•Mind Control•Alcohol •M/M•M/M/M

1 Justin (the bigger the better) by Giant Worshipper A young man starts growing, and growing. He finds he likes it a lot. 15 parts 99k words (#28) Added Nov 2009 477k views 4.3 stars (93 votes) No comments yet •Cock Growth•Huge Cock•Hyper Cock•Straight to Gay•Hyper Strength•Muscle Breast•Muscle Growth•Muscle Gut•Muscle/Strength•Muscle Worship•Man Scent•Increased Libido•Getting Taller•Giants•Size Increase•First Time/Virgin

2 Max’s wish by Bulge101 Scrawny Max uses his wish-power to make himself worthy of the extremely hot bully he has a crush on, but his friend Bobby deserves his help, too, and soon lots of changes start happening at school and at home. 11 parts 25k words Added Aug 2011 Updated 2 Nov 2011 335k views 4.6 stars (85 votes) No comments yet •Cock Growth•Huge Cock•Muscle Growth•Muscle/Strength•Size Increase•Infectious •M/M•M/M/M

3 Above average by Ziel 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. 28 parts 130k words (#12) Added Apr 2013 Updated 8 Dec 2018 313k views 4.6 stars (109 votes) No comments yet •Cock Growth•Ball Growth•Huge Cock•Hyper Cock•Hyper Cum•Public Orgasm•Hyper Muscle•Muscle Growth•Muscle/Strength•Public Nudity•Butt Growth•Retcon •M/M•M/M/M•M/M/M/...

4 Spice by Mr. X and Mad Dog In this epic story, the transformative powers of a certain substance are tested by a couple of very horny guys. 50 parts 221k words (#4) Added Oct 2009 Updated 9 Nov 2019 265k views 4.4 stars (66 votes) No comments yet •Cock Growth•Huge Cock•Other Mental Changes•Hyper Muscle•Hyper Strength•Muscle Growth•Muscle Theft•Muscle/Strength•Muscle Worship•Man Scent•Foot Growth•Gradual Change•Transformation•Voice Deepening•Getting Taller•Size Increase•Hair Growth/Getting Hairy•Age Difference•Incest•Father/Son•Supernatural•Gay Pride•Alcohol •M/M•M/M/M

5 All good things by Anon Amon 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. 111 parts 133k words (#9) Added Feb 2017 Updated 29 Oct 2022 255k views 4.6 stars (155 votes) No comments yet •Cock Growth•Cockfucking•Huge Balls•Huge Cock•Hyper Cock•Cum inflation•Hyper Cum•Nipple Emissions•Straight to Gay•Hyper Muscle•Hyper Strength•Immobility•Muscle Growth•Muscle/Strength•Giants•Size Increase•Incest•Brothers•Twins•Infectious•Pagan gods•Complete •M/M•M/M/M

6 Jason’s big problem by Joven Teen athlete Jason unwittingly becomes part of a shady experiment to produce progressively larger cocks and balls that generate way too much cum. His playful and curious friends get drawn in, and when his cranky brother is roped in as well, having massive equipment becomes even more difficult. 49 parts 115k words (#19) Added Oct 2013 Updated 24 Nov 2017 238k views 4.5 stars (83 votes) No comments yet •Cock Growth•Huge Balls•Ball Growth•Huge Cock•Hyper Cock•Hyper Cum•Muscle Growth•Muscle/Strength•Getting Taller•Size Increase•Incest•Brothers •t/t•t/t/t

7 Medicine show by Fafhrd and Longbow9 Underendowed College student Terry comes in contact with a mysterious “extension cream” that turns out to be the real thing. Soon, he and his male and female friends are transforming themselves, and some are unable to stop. 174 parts 250k words (#2) Added Feb 2012 Updated 22 Feb 2014 231k views 4.5 stars (26 votes) No comments yet •Cock Growth•Ball Growth•Huge Cock•Hyper Cock•Self-suck•First Time/Virgin•Bisexual•Hetero Sex•Lycra/Spandex•Infectious •M•M/M•M/F•M/F/F•M/M/F

8 My roommate (complete) by LenZelig Bill’s hot adventures with his irresistible sex-god of a roommate, Andy Wang, and the others drawn into his adventures, combined with the stories of Andy’s son and his friends. (This revised and updated compilation version includes both “My Roommate” and “My Roommate: The Next Generation.”) 29 parts 223k words (#3) Added Jul 2002 Updated 19 Jun 2021 189k views 4.5 stars (26 votes) No comments yet •Cock Growth•Huge Cock•Muscle Growth•Muscle/Strength•Age Difference•First Time/Virgin•Incest•Brothers•Father/Son•Bisexual•Hetero Sex•Dom/Sub•Witch/Warlock/Wizard•Gay Pride•Mind Control•Complete •M/M•M/M/M•M/M/M/...•t/t•M/t•M/F•M/M/F

9 Puberty is a bitch by Lover Boy 2 Brad thought he was done with puberty, so he’s perplexed and a bit alarmed by a new wave of growth that keeps hitting him at just the wrong moment. 11 parts 15k words Added Sep 2009 187k views 4.3 stars (31 votes) No comments yet •Cock Growth•Huge Cock•Hyper Cock•Muscle Growth•Gradual Change•Size Increase •t/t

10 Mind and body by BRK Jack discovers that his knack for hypnosis is actually much more powerful than it should be. Naturally, he uses this to get the upper hand with his sexy jock brother, but that turns out to be a lot more complicated than he’d thought. 16 parts 66k words (#57) Added Jun 2012 Updated 28 Jul 2017 177k views 4.8 stars (108 votes) No comments yet •Always Hard•Cock Growth•Huge Cock•Multicock•Straight to Gay•Muscle Growth•Muscle/Strength•Always Shirtless•Getting Taller•Size Increase•App•Suggestion•Incest•Brothers•Hypnosis•Mind Control •t/t•t/t/t•t/t/t...

11 An unexpected inflation by UberPump A college athlete named Keith and his friends discover what it feels like to enlarge their cock and balls with the mysterious device Keith ordered off the dark web. When things go awry, however, their packages get huge. Keith and his friends go on a massive journey of cock growth, bloated balls, and near exploding junk as they inflate their man parts to their absolute limit. 41 parts 99k words (#29) Added Apr 2020 Updated 10 Jun 2023 163k views 4.9 stars (67 votes) No comments yet •Cock Growth•Cock Pumping•Cockfucking•Huge Balls•Ball Growth•Huge Cock•Hyper Cock•Cum inflation•Cum Milking•Hyper Cum•Public Orgasm•Addiction•Straight to Gay•Hyper Muscle•Pec Fucking•Immobility•Muscle Growth•Muscle/Strength•Public Nudity•Increased Libido•Breast Expansion•Getting Handsomer•Voice Deepening•Getting Taller•Forced Growth•Size Increase•Inflation•App•Nanotech•Incest•Brothers•Bisexual•Hetero Sex•Nonconsensual change•Gross Bodily Fluids•Dildos/Toys•Infectious •M/M•M/M/M•M/M/F

12 Bigger issues by muscl4life Thanks to Kyle, Sean discovered his serum works better than he expected… And now his freaking muscular lover each time is more intoxicated with his newly found POWER, and can such difference of muscular capacity make the couple apart? 6 parts 47k words (#91) Added Dec 2013 151k views 4.0 stars (24 votes) No comments yet •Always Hard•Cock Growth•Huge Cock•Hyper Cock•Multi-abs•Straight to Gay•Muscle Growth•Muscle/Strength•Muscle Worship•Size Increase •M/M

13 Empire by LenZelig A massive consolidation of the entire “Bill’s Education” universe, incorporating the previously separately posted “The Surfer”, “The Rescue”, “Spring Break”, “Pickup Trouble”, and “School Days”, “Empire” is the wide-ranging tale of easy transformation and even easier sex across all boundaries—friends, family members, genders, even species—as a fortunate crop of humans stumble into a wider universe of size, muscle, double-digit-length cocks and much, much more and discover the true meaning of shared, radical, uninhibited pleasure. 40 parts 366k words (#1) Added Apr 2019 Updated 1 May 2021 148k views 3.7 stars (6 votes) No comments yet •Cock Growth•Huge Cock•Self-suck•Straight to Gay•Muscle Growth•Muscle/Strength•Getting Taller•Size Increase•Age Difference•Bestiality•First Time/Virgin•Incest•Brothers•Father/Son•Twins•Bisexual•Hetero Sex•Nonconsensual change•Sex-Slave•Shared Body•Aliens•Space Travel•Witch/Warlock/Wizard•Thanksgiving•Mind Control•Complete

14 Chuck, the size thief by spacevlad Chuck, a middling-sized construction worker who wishes he were bigger, finds a way to grow huge. 16 parts 42k words Added Jun 2017 Updated 22 Dec 2017 147k views 4.6 stars (33 votes) No comments yet •Cock Growth•Huge Cock•Hyper Cock•Hyper Cum•Getting Dumber•Other Mental Changes•Muscle Growth•Muscle Gut•Muscle Theft•Muscle/Strength•Belly Growth•Voice Deepening•Giants•Plausible Size Difference•Size Decrease•Size Increase•Hair Growth/Getting Hairy•Getting Fatter•Inflation•Nanotech•Destruction/Violence•Nonconsensual change•Nonconsensual sex•Absorption •M/M

15 The dudes by BRK The guys at school are really susceptible to suggestion—so much so that if you tell them something’s true, it turns out that it actually is true. (Slightly revised throughout as of May 2025.) 8 parts 22k words Added Mar 2010 Updated 17 May 2025 144k views 4.7 stars (59 votes) No comments yet •Always Hard•Cock Growth•Huge Balls•Ball Growth•Huge Cock•Self-suck•Hyper Cum•Public Orgasm•Multi-abs•Straight to Gay•Muscle Growth•Muscle/Strength•Public Nudity•Increased Libido•Getting Handsomer•Getting Taller•Plausible Size Difference•Size Increase•Tongue Growth•Retcon•Suggestion•Incest•Brothers•Hyper Pheromones •M/M•M/M/M•M/M/M/...

16 So much cum by Delinqual Cory has a condition that causes him to produce extremely abnormal amounts of semen. It’s not always fun, but it has led to some very memorable moments. 2,165 words Added May 2012 144k views 4.2 stars (25 votes) No comments yet •Hyper Cum •M/M

17 Brother-in-law by Jock Ace, a Marine, meets and becomes enamored of his sister’s fiancé, Josh. A rare (for Metabods) tale with no alterations. 13k words Added May 2006 143k views 4.7 stars (99 votes) No comments yet •Huge Cock•Muscle/Strength

18 Forced growth by hyperboi Tyler wakes up trapped in a room where everything seems geared toward forcing him to become bigger, stronger, and sexier. 5 parts 6,397 words Added Oct 2013 143k views 4.4 stars (56 votes) No comments yet •Cock Growth•Cock Pumping•Huge Cock•Hyper Cock•Other Mental Changes•Straight to Gay•Muscle Growth•Muscle/Strength•Forced Growth•Nonconsensual change •M

19 Baby brother by Shawn D. Stewart "Kev, did you see a glass here?” “Whoa, man, was that yours? Sorry… I was really thirsty…” “You drank it!?” Aaaaand off we go! 2,879 words Added Mar 2003 134k views 4.5 stars (42 votes) No comments yet •Cock Growth•Muscle Growth•Muscle/Strength•Getting Taller•Incest•Brothers

20 Big changes by Ziel Troy’s rapidly growing hypercock is getting kind of embarrassing, especially as it’s caught the attention of a pair of obsessive and very uninhibited twins. 23 parts 104k words (#26) Added Dec 2013 Updated 22 Feb 2025 130k views 4.7 stars (40 votes) No comments yet •Cock Growth•Huge Balls•Ball Growth•Hyper Cock•Hyper Cum•Incest•Twins•Dildos/Toys•Christmas•Easter•Gay Pride•Halloween•New Year’s Eve•Valentine’s Day•Stories with Images •M/M•M/M/M

1BRK  6,967,979 views across 375 stories
Most viewed: Mind and body, The dudes, Changing Nick, Oh man, One hot summer, Cool bracelet, bro, Mutation, Metaboi, Casey’s mancock, Sexi-Phi, The power of suggestion, King size

2Ziel  2,248,396 views across 102 stories
Most viewed: Above average, Big changes, Geno-type, Hyper active imagination, Claves, the midnight marauder, Gooed friends, Little bro, The biggest dick, Bet you can’t have just one, Thoros, X-mass, Peen genie

3Also Known As  1,615,852 views across 59 stories
Most viewed: Hard body, Supermen, Transform, Naked, Seducers, Drug test, The good freak, Transform: Muscle City, Transform: New Blood, Augmentations, The new guy, Nobody’s perfect

4FanTCMan  1,110,018 views across 31 stories
Most viewed: The brothers, Ad man, Brad’s big change, David devolving, Chris olympus, Company guys, Curious cats, Twelve steps back, Jim’s shot, A perfect revenge, Fantastic island, Family values

5Josh Dugan  1,090,128 views across 90 stories
Most viewed: Gay centaur, Aaron, Four-legged Ivan, Brother’s closet, The four jocks continued, Centaur mania, Penis juice, Penis food, Humantaur, Boytaur cream, Eric’s jackoff socks, Body love

6RdyRoger  926,213 views across 26 stories
Most viewed: Huge changes: Book one, The salt, The gene gene, John the wizard, The Latin twins, Joey’s genie, Figurines, Fred’s odyssey, The dorm revised, Contamination, Sugar packets, The clockwork dial

7Richard Jasper  924,869 views across 83 stories
Most viewed: The Change, Big little rich boy, The acolytes, My brother’s boyfriend, Gym fantasy, Grower, On the bus, Best buds, Airport muscle, About that boy, The Change continues, The muscle machine

8MaxMorphs  838,301 views across 20 stories
Most viewed: Think bigger, Sam and Bolt, Red pills, The bodyguards, No reason, Under control, Ever growing, The lucky accident, Dylan & Josh, Growing relationship, Muscle milk, Gaining roommates

9JayPat  759,958 views across 19 stories
Most viewed: The hulk pill, Second puberty, I wanna get huge, The gifted child, Titanification, The bet, The orphanage, The swimming hole, Green legacy, Eustace conquers the world, The guinea pig, The hike

10muscl4life  688,275 views across 17 stories
Most viewed: Bigger issues, Bull’s strength, Bigger issues: Ultimate growth, Derek’s rebirth, Blood lust, The curse, Power geek, Muscle evolution, Biggest man of them all, Payback, Friendship, Lazarus

11brazboy  674,772 views across 76 stories
Most viewed: Bull brothers, The cum fairy, Cave on the Moon, Synthetic reality, Check this mate, New normal, Eggmen chronicles, MIL: Men of Incredible Length, Noel’s literary gift, My brother’s closet, Superstud and Macromale: The Sword of Justice, Part-time job

12Unknown  633,582 views across 30 stories
Most viewed: 17 inches, Matt grows up, Grow gravity, For lovers of huge cocks, Big Frank, Experiment in fantasy, Worship, A devil of a deal, Huginex, See Chris grow, Cream, Muscle lab

13spacevlad  593,418 views across 12 stories
Most viewed: Chuck, the size thief, Ben gets huge, Tank the bouncer, Summer research, Jon the growing stepdad, Away game, Jake: hand-drawn giant, They’re really sensitive now, Time to bulk up, Orc night at the Eagle, They’re too sensitive now, Magic the Growthering

14Giant Worshipper  584,776 views across 2 stories
Most viewed: Justin (the bigger the better), Graham

15NBCK99  582,041 views across 27 stories
Most viewed: Alpha House, Enchanted growth, Shift, Coffee coffee, Tales of a growing teen, Changes in Bigby Heights, Take me, change me, The four jocks: College buddies, The reform party, The bonding, Charlie, Real daydreams

Cum dosing by BRK Mark’s hunky roommate, Aaron, is dead set on getting bigger, and Mark has a vested interest in making it happen. 3 parts 16k words Added Mar 2025 Updated 31 May 2025 16k views 5.0 stars (40 votes) No comments yet •Cock Growth•Ball Growth•Huge Cock•Self-suck•Hyper Cum•Straight to Gay•Muscle Growth•Muscle/Strength•Gradual Change•Size Increase •M/M

Egregious Fantasy by BRK Seth lives a normal life in a humdrum world, until he happens to run into a guy who in every way surpasses anything he’s ever dreamt of. 5,936 words Added May 2025 2,594 views 5.0 stars (5 votes) No comments yet •Huge Cock•Hyper Cum•Pec Fucking•Muscle/Strength•Muscle Worship•Plausible Size Difference •M/M

Best self by BRK “Viral video” doesn’t always mean what you think it means. 2 parts 4,420 words Added Apr 2025 Updated 24 May 2025 8,713 views 4.6 stars (8 votes) No comments yet •Cock Growth•Huge Cock•Other Mental Changes•Straight to Gay•Muscle Growth•Always Shirtless•Getting Handsomer•Getting Taller•Retcon•Nonconsensual change•Shapeshifting •M•M/M

The dudes by BRK The guys at school are really susceptible to suggestion—so much so that if you tell them something’s true, it turns out that it actually is true. (Slightly revised throughout as of May 2025.) 8 parts 22k words Added Mar 2010 Updated 17 May 2025 144k views 4.7 stars (59 votes) No comments yet •Always Hard•Cock Growth•Huge Balls•Ball Growth•Huge Cock•Self-suck•Hyper Cum•Public Orgasm•Multi-abs•Straight to Gay•Muscle Growth•Muscle/Strength•Public Nudity•Increased Libido•Getting Handsomer•Getting Taller•Plausible Size Difference•Size Increase•Tongue Growth•Retcon•Suggestion•Incest•Brothers•Hyper Pheromones •M/M•M/M/M•M/M/M/...

The four Ds by BRK Four close friends get away for a mountain cabin vacay, only for the environs to make them hornier than usual. 11 parts 48k words (#89) Added Apr 2024 Updated 10 May 2025 18k views 4.8 stars (26 votes) No comments yet •Cock Growth•Cockless•Self-suck•Nipple Emissions•Multicock•Multihead•Multiarm•Multileg•Multilimb•Multitorso•Replication•Muscle Growth•Increased Libido•Detachable•Getting Handsomer•Voice Deepening•Getting Taller•Plausible Size Difference•Size Decrease•Mouthcock•Incest•Brothers•Body Swap •M/M•M/M/M•M/M/M/...

Body and mind by BRK Exasperated by college, work, and home life, Barry stumbles across an obscure app that might at least help make his insufferable, annoyingly sexy older brother Vince a tad easier to live with. 7 parts 39k words Added Nov 2024 Updated 3 May 2025 23k views 4.7 stars (41 votes) No comments yet •Always Hard•Cock Growth•Huge Cock•Self-suck•Public Orgasm•Replication•Other Mental Changes•Straight to Gay•Muscle Growth•Muscle/Strength•Always Shirtless•Increased Libido•Getting Handsomer•App•Retcon•Suggestion•Incest•Brothers•Nonconsensual change•Hypnosis•Mind Control •M/M•M/M/M•M/M/M/...

Kris and Minato by BRK Two best friends on a class trip get some help declaring their feelings for each other. 7 parts 30k words Added Nov 2024 Updated 26 Apr 2025 17k views 4.9 stars (19 votes) No comments yet •Always Hard•Cock Growth•Cockfucking•Huge Balls•Ball Growth•Huge Cock•Hyper Cock•Hyper Cum•Nipple Emissions•Multicock•Multiarm•Hyper Muscle•Muscle Breast•Muscle Growth•Muscle/Strength•Always Shirtless•Stretchy•Butt Growth•Hyper Anus•Increased Libido•Getting Handsomer•Voice Deepening•Getting Taller•Plausible Size Difference•Size Increase•Hyper Tongue•Tongue Growth•First Time/Virgin•Incest•Brothers•Twins•Complete •M/M

Birthday benefaction by BRK Esmond is thrilled. His birthday has finally come, and he’s looking forward to the end of his year of service with the prickly, sarcastic mage in the tower. What he’s not expecting, though, is a birthday gift from the old man. Does he have an ulterior motive? 2,528 words Added Apr 2025 2,161 views 5.0 stars (8 votes) No comments yet •Cock Growth•Hyper Cum•Gradual Change•Witch/Warlock/Wizard•Complete •M•M/M

Guy lines and tent poles by BRK Jacob and Luke’s camping getaway to rekindle their college bromance gets a tent stake in the works when Jacob invites along a dweeby coworker with a secret stash of very powerful weed. 3,312 words Added Apr 2025 3,748 views 5.0 stars (3 votes) No comments yet •Huge Cock•Cock Body•Hyper Cock•Straight to Gay•Muscle Growth•Muscle Theft•Getting Taller•Size Decrease•Size Increase•Hair Growth/Getting Hairy•Sex-Slave•Cannabis •M/M/M

Fallout by BRK Jesse comes home exhausted and just wants to put his feet up. That warning notice on his front door can wait, right? 2,206 words Added Apr 2025 3,629 views 4.3 stars (6 votes) No comments yet •Cock Growth•Huge Balls•Ball Growth•Huge Cock•Hyper Cock•Hyper Cum•Foot Growth•Gradual Change•Size Increase•Nonconsensual change•Complete •M/M

Oliver’s alone time by BRK There’s one pastime Oliver likes to indulge in when he gets some time to himself, and over the years he’s gotten really good at it. 2,646 words Added Apr 2025 2,745 views 4.8 stars (9 votes) No comments yet •Cock Growth•Huge Cock•Self-suck•Gradual Change•Complete •M

Snap card by BRK Bored in Venice, two close friends decide to play a knock-off card-competition game they found in the market. It doesn’t go the way they expect. 2,077 words Added Apr 2025 2,197 views 4.6 stars (7 votes) No comments yet •Cock Growth•Huge Cock•Multicock•Multiarm•Multilimb•Stacking•Muscle Growth•Getting Taller•Retcon •M/M

Griff the natural by BRK On a relaxing cross-country road trip, Griff can’t help but make a couple of sexy new friends. That’s just the way his life goes. 3,531 words Added Apr 2025 2,094 views 5.0 stars (3 votes) No comments yet •Public Orgasm•Straight to Gay•Always Shirtless •M/M/M

Support line by BRK Customers interacting with the reps at the Metabods Support Line tend not to get the service they’re expecting—though it is always above and beyond. 5 parts 15k words Added Feb 2012 Updated 29 Mar 2025 36k views 4.8 stars (18 votes) No comments yet •Always Hard•Cock Growth•Huge Cock•Hyper Cock•Self-suck•Multicock•Multiarm•Multilimb•Multitorso•Replication•Muscle Growth•Always Shirtless•Detachable•Getting Handsomer•App•Selfcest•Infectious•All Dialog•Cannabis •M/M

Nate the Natural by BRK Nate’s in a new city with a new job, but he’s not to put out about it. He makes friends pretty darn easily. Really good friends. 3 parts 6,296 words Added Oct 2024 Updated 8 Mar 2025 5,123 views 4.5 stars (10 votes) No comments yet •Public Orgasm •M/M•M/M/M•M/M/M/...

The cock by BRK Waking up after sex with Steve is a little disorienting. He’s lying on top of his lover from the night before—because he’s now Steve’s cock. 3 parts 7,012 words Added Oct 1997 Updated 22 Feb 2025 30k views 4.7 stars (24 votes) No comments yet •Huge Cock•Human to Cock•Transformation•Body Swap •M/M

Country roads by BRK At a traffic stop on a lonesome highway, a small-town cop named Paul encounters two cocky out-of-towners, one of whom seems able to get inside Paul’s head. 5 parts 12k words Added Jun 2024 Updated 15 Feb 2025 10k views 4.8 stars (17 votes) No comments yet •Cock Growth•Other Mental Changes•Straight to Gay•Muscle Growth•Suggestion•Nonconsensual change•Mind Control•Complete •M/M•M/M/M

Rings of confirmation by BRK Lovers Edwin and Uri are in Paris, wandering the busy banks of the Seine, when they are offered a pair of supposedly magic rings. 3,496 words Added Feb 2025 3,016 views 4.4 stars (5 votes) No comments yet •Cock Growth•Huge Cock•Hyper Cock•Retcon•Nonconsensual change•Complete •M/M

Body game: Encounter 813 by BRK Reggie isn’t sure why the team-building get-together for the web design firm he’s working for is being held at an abandoned mall; he just knows he can’t get his sexy boss out of his mind. 10 parts 54k words (#80) Added May 2016 Updated 15 Feb 2025 49k views 4.9 stars (35 votes) No comments yet •Always Hard•Cock Growth•Huge Balls•Huge Cock•Hyper Cock•Hyper Cum•Extra digits•Multi-abs•Multicock•Multiarm•Multilimb•Multipec•Multitongue•Replication•Stacking•Muscle Growth•Stretchy•Foot Growth•Getting Taller•Plausible Size Difference•Size Increase•Hair Growth/Getting Hairy•Hyper Tongue•Tongue Growth•Mouthcock•Incest•Brothers•Selfcest •M/M•M/M/M

Snowboarder blues by BRK Axel, a talented snowboarder, grumbles in frustration in his hotel room as two injured wrists prevent him from taking care of his mounting need. 2,008 words Added Feb 2025 2,877 views 4.8 stars (4 votes) No comments yet •Cock Growth•Huge Cock•Multicock•Multihead•Multiarm•Multilimb•Multipec•Stacking•Muscle Growth•Increased Libido•Retcon•Complete •M/M