Stories involving a significant increase in the need for sex.
Related: Ass Growth; Belly Growth; Breast Expansion; Detachable; Foot Growth; Getting Handsomer; Gradual Change; Male Pregnancy; Transformation; Voice Deepening.
Child of: Other Physical Changes.
Top Stories: “The dudes”; “The salt”; “Second puberty”; “Enlargement”; “His cock gets huge”; “Navy experiment”; “Mass X”; “Bigger issues: Ultimate growth”; “Transform: New Blood”; “Sk8r dreams”.
Recently Updated: “Resolutions”; “Muscle seduction”; “Keep your promises”; “The witch’s menagerie”; “From the files of the Magic Misuse Office”; “Curses and consequences”; “The training program”; “The expedition”; “The Ixlutani”; “A legal contract for services to be rendered”.
55 stories found. Total word count: 1,264,146.
- Cadence by BRK CockUp Cock MuscUp Musc Libido Handsomer Taller PSD SizeUp Viol Witch Immort Ancient M/M Lucius, an ex-ancient Roman whose peculiar curse involves the beauty of the men around him, suddenly finds that everything he thought he knew about his uncontrollable abilities has changed when he's discovered by a trooper one night sleeping in his car on a lonely stretch of Midwestern highway. Added Nov 2016 Updated Mar 2019 6 parts 30,727 words 15,563 views 4.6 stars (12 votes)
- The clockwork dial by RdyRoger CockUp Cock MuscUp Musc Libido Grad AgeDn Hairier A man finds what looks like a beat-up old pocket watch, but when he gets it working again he finds its intricate dials and mechanisms are actually designed to make other guys incrementally—like his roommate Gabe, for example. Added Apr 2012 3,603 words 20,680 views 4.7 stars (16 votes)
- Cody and Todd by klj CockUp Cock CumInf 2Gay Libido Little green pills lead to roommate fun. Added Jun 2005 2,654 words 13,330 views 5.0 stars (5 votes)
- Coffee coffee by NBCK99 AlwHard CockUp Cock Mental 2Gay MuscUp Musc Libido Taller SizeUp The employees at the campus’s hottest coffee shop seem to be getting sexier… and so are the customers. Added Dec 2010 2 parts 5,251 words 29,672 views 4.8 stars (22 votes)
- Company guys by FanTCMan CockUp Cock Mental 2Gay MuscUp Musc Libido Hairier AgeDiff Inc Dad You can’t even imagine how excited Joey and I were, excited and scared, when Dad said he was going to give us the formula he’d been sampling. We were going to be models for what he called the Company. Added Dec 2002 2 parts 7,919 words 29,191 views 4.7 stars (10 votes)
- Cursed cocks by CockTFBoi CockUp CockDn CumInf HyCum PublicOrg FTM Addict 2Gay MuscUp Scent Libido Grad Hairier HairDecr Nonc HyPher M/M M/M/M/... Marcus is having a horny night in the dorm when an inadvertent wish by his roommate sends him on a path to a new life. Added Aug 2020 8 parts 25,154 words 8,892 views
- Curses and consequences by BRK AlwHard CockUp Cock Self AlwCum HyCum XAbs XArms XLimb Addict Libido Grad Taller Retcon SocMed Supn Reading this story is a bad idea, but you can’t resist now that you know it’s cursed. Added Sep 2021 1,456 words 2,687 views 4.8 stars (9 votes)
- Daemos island by Charles Westfall CockUp Cock MuscUp Musc Libido SizeUp AgeDiff Inc Dad Twins Viol A Polish scientist and explorer, Ferdinand Rolcek, discovers a hidden island where the lost secrets of the Daemos, alien pioneers of masculine beauty and sexuality far beyond anything known to humanity, are finally revealed to him; and what he learns makes him never want to leave again. Don’t worry, he won’t be lonely. Added Feb 2003 6 parts 14,639 words 26,365 views 3.2 stars (20 votes)
- The dudes by BRK AlwHard CockUp Balls Cock Self HyCum PublicOrg XAbs 2Gay MuscUp Musc Libido Handsomer PSD SizeUp TongueGr Retcon Sugg Bro HyPher t/t t/t/t t/t/t... 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. Added Mar 2010 Updated Mar 2016 7 parts 15,936 words 102,050 views 4.6 stars (34 votes)
- Heavy quarantine by Portowulf CockUp HyCum MuscUp BellyUp Libido Fatter Infl Pandem Boyfriends Vincent and Coy ride out the quarantine together, for extended time. Added Apr 2020 2,778 words 5,675 views 4.7 stars (9 votes)
- His cock gets huge by Jack Hardwood CockUp Balls Cock HyCock HyCum MuscUp Libido Male model Pietro washes up on a remote island inhabited by a society of men where everyone wants their cock to be as big and fat as humanly possible. Pietro just wants to go home, but his almost constant boner is getting bigger and bigger, and he doesn’t know how much longer he’ll be able to walk. Added Dec 2017 Updated Apr 2018 8 parts 14,650 words 41,049 views 4.8 stars (48 votes)
- Hulkster and Hoppy by Also Known As CockUp Cock MuscUp Scent Libido Handsomer Grad Taller PSD SizeUp Witch Jeremy “Hoppy” Hopkins and Alexander “The Hulkster” Hogan were best friends in high school, but at the twenty-year reunion, the Hulkster discovers what Hoppy has been up to all those years in-between. Added Feb 2021 Updated Jul 2021 23 parts 118,666 words 20,077 views 4.9 stars (54 votes)
- Making contact by StevePwrBear HyCum Musc Libido Tf Virgin Added Mar 2004 3,633 words 9,776 views
- Mariposa honeymoon: A six-pack story by Cris Kane CockUp CockDn Cock Dumber Mental MuscUp Musc AssUp BellyUp Libido SizeDn SizeUp AgeDn Race Hairier Witch Series Their flamboyant best-man Pierce gives strait-laced newlyweds Derek and Charles a mysterious six-pack to liven up their Cancun honeymoon. Added Dec 2018 Updated Feb 2019 19 parts 105,833 words 13,971 views 4.5 stars (11 votes)
- Mass X by Max Mann CockUp Cock 2Gay MuscUp Musc Libido Handsomer Hairier AgeDiff Inc Dad Xmas New Years Five short stories of men getting bigger and sexier, through the use of “Mass X”. Added Feb 2005 5 parts 19,019 words 36,962 views 4.6 stars (14 votes)
- Morphogenic steroids by RdyRoger CockUp Balls Cock Self MuscUp Musc Libido Grad Taller PSD SizeUp Hairier Infect Rod’s dad is working on a new technology that makes small things bigger and big things huge, with incredible implications for food supplies and beyond—only it only lasts for five hours. Rod figures being bigger for five hours… that would be pretty awesome. Added Oct 2019 4 parts 15,297 words 15,714 views 4.4 stars (11 votes)
- Muscle seduction by Azerreza CockUp Cock HyCock HyCum PublicOrg XAbs HyMusc HyStr MuscUp Musc Libido Grad Voice Taller PSD SizeUp Virgin M/M When Nick moves to a new city he hears rumours that it had once been partially destroyed by muscular titans. Not believing it at first, he decides to ignore them. But sometimes… rumours aren’t really rumours! And if it were true that there was a way to grow like that, could he use it to seduce the secret love of his life? Added Aug 2021 Updated Sep 2021 3 parts 35,026 words 7,267 views 4.9 stars (8 votes)
- The salt by RdyRoger CockUp Cock MuscUp Musc Worship Libido Grad Taller SizeUp TongueGr Inc Bro Series Trav gets his hands on some salts that cause all kinds of sexy growth and transformation. Using them on himself is great, but growing other people without their realizing it is even more fun. Added Jun 2010 9 parts 35,754 words 72,331 views 4.7 stars (18 votes)
- The salt: the African-American by RdyRoger CockUp Cock MuscUp Musc Libido Voice SizeUp Race Hairier HairDecr TongueGr Nonc Series Added Jun 2010 3 parts 3,969 words 7,474 views
- The salt: the gym bunny by RdyRoger CockUp Balls Cock HyCum Mental MuscUp Musc Worship Libido Handsomer Voice PSD SizeUp Hairier Nonc Bond Series Added Jun 2010 6 parts 14,393 words 9,729 views
- The salt: the lab assistant by RdyRoger CockUp Balls Cock HyCum Mental MuscUp Musc Libido Handsomer Voice PSD SizeUp Hairier Nonc Series Added Jun 2010 9,042 words 9,239 views
- Second puberty by JayPat CockUp Cock HyStr MuscUp Musc Libido SizeUp Bi Viol HyPher Series Finding out you’re a product of genetic engineering and about to go through your second puberty is shocking enough, but the unforeseen repercussions with school, family, and friends are what really change everything. Added Sep 2012 15 parts 91,454 words 62,476 views 4.8 stars (29 votes)
- The six pack by Cris Kane CockUp CockDn Cock MFSwap Fem Mental 2Gay MuscUp Musc AssUp BellyUp Libido Handsomer Grad Tf Taller SizeDn SizeUp AgeUp AgeDn Race Hairier Fatter Viol Series Returning from a Mexican vacation, a gay couple bring back a mysterious drink for their friends to try, bringing on some changes for the group of friends that require a great deal of getting used to. Added Sep 2018 9 parts 38,564 words 18,228 views 4.9 stars (10 votes)
- Sk8r dreams by Reaver CockUp Cock Rep NoShirts Libido Tf Voice AgeDn Race App Retcon Nonc Infect Mind Series The Maker is an app that gives you the ability to remake the world around you. That means a better house, a hotter body—and it definitely means turning a few guys in your life into happy, hunky skater bois. Added Oct 2003 19 parts 58,830 words 33,566 views 4.2 stars (18 votes)
- Small problems by The Obsessive-Compulsive CockUp Balls Cock HyCock HyCum Libido College freshman Curt has certain inadequacies he’d like to correct. (Hint: Remember the “Better Living through Chemistry” meme?) Added Sep 2009 7 parts 9,668 words 31,966 views 5.0 stars (6 votes)
- The smell of lust by Seth Peterson Cock 2Gay MuscUp Libido Tf SizeUp Hairier Nonc HyPher Fur Scaly Dragon M/M I did a thing!! Okay, I accidentally bathed myself in extremely potent, gay-causing, transformative pheromone juice. But it’s all good, right?? Added Jun 2016 11,127 words 20,087 views 4.2 stars (13 votes)
- Tim’s adventure by WordShop CockUp Cock HyCum MuscUp Musc Libido Grad SizeUp Hairier Virgin Tim finds romance becomes a little more complicated when muscle growth and hypermasculity is involved. Added Jan 2018 Updated Feb 2018 5 parts 34,729 words 21,996 views 4.4 stars (14 votes)
- The training program by BRK AlwHard CockUp Self HyCum Addict Mental 2Gay MuscUp Musc NoShirts Libido Handsomer Grad Tf Taller PSD SizeUp Hairier Dom Nonc Slave Alien Recruited to take part in an intense and highly selective three-week LEO training program, Texas Ranger Dusty thinks he and his fellow trainees are in for a lot of hard work and conditioning. What he doesn’t know is what exactly these elite law-enforcement men are being trained for. Added Aug 2021 5 parts 8,850 words 5,099 views
- Transform: New Blood by Also Known As AlwHard CockUp Cock Self XCock MuscUp Musc Worship Scent Libido Voice SizeUp Virgin Infect Fly Series The formula Carlos developed, Transform, has made him and his friends into veritable gods. Soon their numbers will be growing, thanks in part to a video featuring a guy known only as Self-Suck Sam. Added Jan 2014 47 parts 188,423 words 33,979 views
- Twelve steps back by FanTCMan CockUp Balls Cock Addict Mental 2Gay MuscUp Musc Worship Libido Handsomer Ian pursued working out as a way of chasing off his inner demons. Then he heard about a serum that seemed to make you not just bigger, but enhanced everything about you that was masculine and sexy. And if it made you horny too, well, that was fine by him. Added Nov 2003 Updated Mar 2018 9 parts 33,235 words 24,712 views 4.7 stars (13 votes)
- Weho adventure by FanTCMan CockUp Cock MuscUp Musc Libido Handsomer Taller SizeUp Hairier The only thing hotter than seeing the amazing bodybuilder Steve Reilly was the possibility of catching his eye. Added Feb 2003 10,627 words 12,453 views 4.9 stars (8 votes)
- What happened by Dream Big CockUp Cock MuscUp Musc Libido Tf Bi When Daniel meets up after college graduation with his high school friends Chris and Jane for a beach vacation, it turns out Chris has some important news: first, he’s into both of them, and second, he’s got access to his family’s secret body transformation serum, and he’s willing to share. Added Nov 2019 2 parts 8,209 words 6,729 views 5.0 stars (7 votes)
- The witch’s menagerie by NaughtyKitchenware CockUp Balls Self HyCum PublicOrg Wings Nude Libido Tf SizeDn 2Animal Hairier AgeDiff Bi Het Witch Fly Deep in the forest, as far away from civilization as possible, lives an old but youthful witch. A witch who needs some help from young mortals in gathering her special ingredients. The job description includes some… adaptations, but her latest recruit doesn’t seem to mind at all. Added Sep 2021 6,734 words 1,551 views