Butt Growth

• 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.  •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/...  Added Apr 2013 Updated Dec 2018 28 parts 130,435 words 251,951 views 4.5 stars (97 votes)
• An airplane parasite by SomeMuscleGuy  [  ]  After bumping into the wrong person at the airport, Michael is infected with a parasite that was on its way to be destroyed. This parasite only has one goal in mind: Growth. Massive Growth.  •Cock Growth •Huge Balls •Ball Growth •Huge Cock •Hyper Cock •Hyper Cum •Multi-abs •Hyper Muscle •Hyper Strength •Immobility •Muscle Growth •Butt Growth •Foot Growth •Transformation •Voice Deepening •Getting Taller •Giants •Size Increase •Destruction/Violence •Nonconsensual change •Infectious •Aliens •Symbiotes •M  Added Oct 2022 4,977 words 8,925 views 4.7 stars (23 votes)
• The alpha touch by Caliburn  [  ]  Young engineer Max has a good deed rewarded with a mysterious rune now tattooed to his wrist. Bestowed with the power to change the body of the men he touches, Max’s life and his friends’ change quite a bit.  •Cock Growth •Huge Balls •Huge Cock •Straight to Gay •Muscle Growth •Butt Growth •Increased Libido •Gradual Change •Voice Deepening •Getting Taller •Size Increase •Getting Hairy •Suggestion •Hetero Sex •Dom/Sub •Nonconsensual change •Series •M/F •M/M  Added Jan 2022 Updated Mar 2022 11 parts 42,342 words 52,465 views 4.9 stars (182 votes)
• Ascension Escape Games by SomeMuscleGuy  [  ]  Welcome to Ascension Escape Games where you have two hours to escape the largest Escape Room in the world—alone! But be careful, if you aren’t quick enough, you may just grow too large before you can find a way out.  •Cock Growth •Ball Growth •Huge Balls •Huge Cock •Hyper Cock •Hyper Cum •Multi-abs •Hyper Muscle •Hyper Strength •Immobility •Muscle Growth •Butt Growth •Foot Growth •Transformation •Voice Deepening •Getting Taller •Giants •Size Increase •Destruction/Violence •Nonconsensual change •M  Added Oct 2022 6,147 words 5,710 views 4.8 stars (16 votes)

• Beefcake by Zero  [  ]  They say you are what you eat—especially true for magical foodstuffs with growth-inducing powers—and wimpy freshman Bradley is about to take a bite.  •Cock Growth •Huge Cock •Pec Fucking •Muscle Growth •Muscle/Strength •Butt Growth •Getting Handsomer •Getting Taller •Size Increase  Added Feb 2021 1,591 words 13,487 views 4.5 stars (11 votes)
• The breakthrough by Gigantic Mr.B  [  ]  One lapse in concentration sets off an unstoppable chain of events for an 18-year-old lab intern, Ben.  •Cock Growth •Huge Balls •Huge Cock •Hyper Cum •Hyper Muscle •Hyper Strength •Muscle Growth •Butt Growth •Gradual Change •Getting Taller •Size Increase •Infectious •M/M  Added Apr 2022 Updated Sep 2022 5 parts 18,273 words 23,590 views 4.9 stars (75 votes)
• The bubblebutt curse by Gato-Cat  [  ]  Picky Luke, who prefers bottom-heavy men, gets cursed so that every man he finds attractive grows a massive, sensitive bubble butt.  •Butt Growth •Inflation •Nonconsensual change •M/M  Added Sep 2022 3,407 words 3,553 views 5.0 stars (23 votes)
• Bulking by Proteus  [  ]  Sometimes, when people have a crush on their hunky roommate, they act on it by secretly trying to make the guy progressively hotter.  •Muscle Growth •Muscle Gut •Muscle/Strength •Butt Growth •Gradual Change •Getting Hairy  Added Mar 2013 6 parts 7,143 words 47,434 views 4.6 stars (17 votes)

• A close encounter by King Dave  [  ]  Evan is not alone in his apartment. Something that wants to study him. Is that all that it wants?  •Cock Growth •Muscle Growth •Butt Growth •Getting Handsomer •Voice Deepening •Getting Hairy •First Time/Virgin •Aliens •Shapeshifting •M/M  Added Dec 2021 Updated Jan 2022 3 parts 7,234 words 7,971 views 4.9 stars (21 votes)
• Clowning around by screamingmoist  [  ]  A group of arrogant young men get a surprise visit, but it’s no laughing matter.  •Cock Growth •Muscle Growth •Butt Growth •Transformation •Inflation •M/M •M/M/M  Added Aug 2022 3,664 words 4,750 views 4.5 stars (6 votes)
• Corporate growth by screamingmoist  [  ]  Corporate growth can take on a whole new meaning if you cross the wrong people.  •Cock Growth •Getting Dumber •Straight to Gay •Muscle Growth •Butt Growth •Nonconsensual change •M/M  Added Sep 2021 6,574 words 6,895 views 4.0 stars (6 votes)
• Crack the code by screamingmoist  [  ]  A man uses a super computer to write more than mere programs.  •Cock Growth •Cock Shrinking •Muscle Growth •Butt Growth •Size Decrease •Retcon •Series •M/M •M/M/M/...  Added Nov 2021 4,409 words 6,742 views
• Crack the code: Employee of the month by screamingmoist  [  ]  A burnt-out young man with eyes on his boss hopes to have his code rewritten.  •Cock Growth •Getting Dumber •Muscle Growth •Butt Growth •Retcon •Series •M/M  Added Aug 2022 5,761 words 4,034 views

• Dickville by OneLuckyGuy89  [  ]  Rodney Finnegan and his four boys arrive in a Florida marshland town named Dickville. And it doesn’t take them long to figure out how it got that name.  •Cock Growth •Huge Cock •Straight to Gay •Muscle Growth •Man Scent •Butt Growth •Increased Libido •Getting Handsomer •Voice Deepening •Getting Taller •Size Increase •Getting Hairy •Incest •Brothers •Father/Son •M/M •t/t  Added Apr 2022 2 parts 5,446 words 9,564 views 4.4 stars (12 votes)
• Doubling device by Musclesaber  [  ]  Max is in for a surprise when Luke gets ahold of a device that can double anything about a person.  •Cock Growth •Huge Cock •Hyper Cock •Hyper Muscle •Immobility •Muscle Growth •Public Nudity •Butt Growth •Getting Taller •Giants •Size Increase •M/M  Added May 2022 2 parts 5,481 words 10,268 views 4.8 stars (15 votes)

• Frank N. Stein’s monster by Musclesaber  [  ]  Dr. Franklin Nelson Stein has finally done it. He’s perfected a muscle growth formula that he plans on using on his husband Luke. Little do they know how Luke’s body will react to the formula after Luke ingests more than he intended.  •Cock Growth •Huge Cock •Muscle Growth •Muscle Theft •Butt Growth •Getting Taller •Supernatural •M/M  Added Oct 2021 2,826 words 7,263 views 4.9 stars (11 votes)

• The great pumpkin by screamingmoist  [  ]  Four young vandals learn that it’s bad luck to destroy jack-o’-lanterns on Halloween.  •Public Orgasm •Getting Dumber •Other Mental Changes •Straight to Gay •Butt Growth •Increased Libido •Transformation •Size Decrease •Hairless •Nonconsensual change •Horror •Supernatural •Halloween •M/M/M/...  Added Oct 2021 8,028 words 5,178 views 4.7 stars (6 votes)
• The growth race by SomeMuscleGuy  [  ]  John is left growing uncontrollably as he races to be the first person to finish the race, but he may be too large before he reaches the finish.  •Cock Growth •Huge Cock •Hyper Cock •Hyper Cum •Hyper Muscle •Hyper Strength •Immobility •Muscle Growth •Muscle/Strength •Public Nudity •Butt Growth •Transformation •Voice Deepening •Getting Taller •Giants •Size Increase •Nonconsensual change •M  Added Aug 2022 3,701 words 7,692 views 4.8 stars (10 votes)

• Hidden passages by screamingmoist  [  ]  A magical book finds its way to a new author.  •Cock Growth •Huge Cock •Other Mental Changes •Straight to Gay •Muscle Growth •Always Shirtless •Butt Growth •Increased Libido •Getting Handsomer •Transformation •Retcon •Mind Control •M/M  Added Apr 2022 5,254 words 6,191 views 4.6 stars (7 votes)
• Himbo pussy serum by BaraBootyEater  [  ]  Josh and Jason are a pair of horny bio-engineering students who’ve created a serum that can cause some muscly changes to those they give it to.  •Cock Growth •Huge Balls •Huge Cock •Muscle Growth •Butt Growth •Hairless  Added May 2021 1,126 words 10,575 views 3.8 stars (13 votes)

• Kyle’s himbo transformation by Joven  [  ]  Kyle goes on vacation with some friends, then starts to experience a few sudden and unexplained changes.  •Cock Growth •Huge Balls •Huge Cock •Self-suck •Straight to Gay •Pec Fucking •Muscle Growth •Butt Growth •Gradual Change •Dom/Sub •Nonconsensual change •M/M •M/M/M  Added Nov 2021 Updated Dec 2021 14 parts 18,576 words 25,244 views 4.8 stars (26 votes)

• Mariposa honeymoon: A six-pack story by Cris Kane  [  ]  Their flamboyant best-man Pierce gives strait-laced newlyweds Derek and Charles a mysterious six-pack to liven up their Cancun honeymoon.  •Cock Growth •Cock Shrinking •Huge Cock •Getting Dumber •Other Mental Changes •Muscle Growth •Muscle/Strength •Butt Growth •Belly Growth •Increased Libido •Size Decrease •Size Increase •Age Regression •Race/Ethnicity Change •Getting Hairy •Witch/Warlock/Wizard •Series •M/M •M/M/M/...  Added Dec 2018 Updated Feb 2019 19 parts 105,833 words 17,789 views 4.6 stars (12 votes)
• Meta massage therapy by M.M.69  [  ]  A mysterious new massage parlor opened in town, and brothers Jared and Jason have VIP passes. What makes this place so special?  •Always Hard •Cock Growth •Huge Balls •Huge Cock •Hyper Cock •Multicock •Multihead •Boytaur •Four Legs •Multiarm •Multileg •Multilimb •Multipec •Multitorso •Replication •Straight to Gay •Hyper Muscle •Hyper Strength •Muscle Growth •Butt Growth •Getting Handsomer •Getting Taller •Plausible Size Difference •Size Increase •Retcon •Suggestion •Age Difference •Incest •Brothers •Father/Son •Dom/Sub •M/M  Added Nov 2021 Updated Jan 2022 3 parts 14,933 words 9,494 views 5.0 stars (14 votes)
• Meteor shower by Tym Greene  [  ]  A couple heads out to a costume party to celebrate a big meteor shower. Little do they know that the party’s host has other plans.  •Female to Male •Male to Female •Gender Swap •Gay to Straight •Other Mental Changes •Butt Growth •Belly Growth •Breast Expansion •Gradual Change •Transformation •Getting Taller •Size Increase •Human to Animal/Anthro •Getting Fatter •Retcon •Bisexual •Hetero Sex •Nonconsensual change •Anthro/Furry •Mermen •M/F •M/M •M/M/F  Added Sep 2021 10,195 words 4,308 views
• MissinGRO by Ziel  [  ]  Javier discovers to his delight that encountering the infamous Pokémon glitch Missingno can have unanticipated real-world effects.  •Huge Cock •Multi-balls •Multicock •Multiarm •Multilimb •Butt Growth •Plausible Size Difference •Size Increase  Added Mar 2017 5,534 words 11,106 views 5.0 stars (8 votes)
• Modern rites by red_king  [  ]  Matt’s life changes forever when he receives divine investiture from an old fertility god, fallen from the pantheon, in exchange for his devotion and cooperation in finding more followers. At first it sounded like work, but soon he’s having too much fun to care.  •Cock Growth •Huge Cock •Hyper Cock •Cum inflation •Hyper Cum •Pec Fucking •Muscle Breast •Muscle Growth •Hyper Anus •Butt Growth •Getting Handsomer •Transformation •Plausible Size Difference •Size Increase •Destruction/Violence •Restraints •Supernatural •Immortality •M/M •M/M/M  Added Dec 2018 Updated Jun 2022 16 parts 46,605 words 32,642 views 4.6 stars (37 votes)
• My new favorite app, Cockr by Clearlyhere  [  ]  John is out of money and finds out about new app where his huge endowment could make him some serious cash.  •Cock Shrinking •Cockless •Huge Cock •Muscle/Strength •Butt Growth •Detachable •App •Dom/Sub •Body Swap •Series  Added Jun 2017 Updated Sep 2017 5 parts 13,713 words 33,917 views 4.7 stars (30 votes)
• Mysterious kidnapping by Joven  [  ]  Jared and Derek are traveling abroad when they’re suddenly kidnapped and secreted away in an isolated room… naked. They naturally become aware of each other’s junk, though Derek isn’t too pleased by Jared’s attention. But the situation with their equipment only gets more intense…  •Cock Growth •Huge Balls •Huge Cock •Muscle Growth •Muscle/Strength •Butt Growth  Added Feb 2018 Updated Apr 2018 13 parts 22,924 words 26,526 views 4.9 stars (19 votes)

• The need to obey by Musiker  [  ]  An enormously large, muscular man has only one thing he wants out of life: to be a good boy for his master. He is searching for a new master to take him in when he finds someone who is willing to give him a try-out, and who is not turned off by his enormous balls and knee-length caged cock.  •Cock Shrinking •Huge Balls •Huge Cock •Nipcocks •Nosecock •Multicock •Multiarm •Multilimb •Gender Swap •Other Mental Changes •Straight to Gay •Muscle/Strength •Crotchhead •Body Parts in Strange Places •Stretchy •Butt Growth •Belly Growth •Foot Growth •Getting Taller •Giants •Plausible Size Difference •Size Decrease •Size Increase •Getting Hairy •Hyper Tongue •Suggestion •Bisexual •Hetero Sex •Cock Cage •Dom/Sub •Sex-Slave •Rubber/Latex •Immortality •M/M •M/M/M  Added May 2019 Updated Nov 2021 10 parts 55,956 words 30,163 views 4.8 stars (20 votes)

• OmniGro by Whatinsomnia and Ziel  [  ]  Dissatisfied with the speed at which the current OTC dick growing serum works, Eli, a brilliant scientist in his own right, sets out to make his own super-powered serum. Eli wastes no time in breaking in the new concoction on himself and his boyfriend. The results speak for themselves and their new product revolutionizes the world as they know it.  •Cock Growth •Cockfucking •Huge Cock •Hyper Cock •Cum inflation •Hyper Cum •Nipple Emissions •Muscle Breast •Muscle Growth •Muscle/Strength •Butt Growth •Size Increase •M/M  Added Mar 2016 3 parts 45,143 words 25,104 views 4.8 stars (9 votes)

• Patient zero by SomeMuscleGuy  [  ]  After exploring a crashed meteorite, Tim and Kyle are left growing uncontrollably. The hornier they get, the larger they grow. But what happens when growth itself makes them horny?  •Cock Growth •Huge Balls •Huge Cock •Hyper Cock •Hyper Cum •Multi-abs •Hyper Muscle •Hyper Strength •Muscle Growth •Butt Growth •Increased Libido •Foot Growth •Transformation •Voice Deepening •Getting Taller •Plausible Size Difference •Size Increase •Nonconsensual change •Infectious •M/M  Added Nov 2022 2 parts 6,438 words 5,773 views 4.6 stars (11 votes)
• The Porter Men by Inclytos  [  ]  The Porters are a family of perfect men, all uniquely perfect in their own way. It’s how it’s always been, right?  •Cock Growth •Cock Shrinking •Huge Cock •Dom to Sub •Getting Dumber •Pec Fucking •Hyper Strength •Muscle Breast •Muscle Growth •Muscle/Strength •Always Shirtless •Butt Growth •Increased Libido •Retcon •Incest •Brothers •Father/Son •Twins •Dom/Sub •Sex-Slave •M/M •M/t •t/t  Added Oct 2022 Updated Nov 2022 3 parts 8,809 words 6,832 views 4.6 stars (19 votes)
• The prince, the knight, and the dragon by brazboy  [  ]  Years ago a curse was created, connecting the fate of the Northern Empire and that of the Southern Kingdom, but also the fates of the Empire’s first Prince, Alecrias, and that of a Dragon which appeared in the southern mountains and seems to behave in ways that benefit the Southern Kingdom. Can his loyal knight and lover, Sir Oberion, save the Prince from being sacrificed to the Dragon? Can the curse be lifted, and what is its true nature?  •Huge Balls •Huge Cock •Self-suck •Hyper Cum •Multi-abs •Hyper Muscle •Immobility •Muscle Growth •Butt Growth •Getting Taller •Size Increase •Tongue Growth •Fantasy Realm •Shapeshifting •Series •M/M  Added Oct 2021 Updated Nov 2021 8 parts 25,069 words 5,680 views

• The radiation zone by SomeMuscleGuy  [  ]  After going off the beaten path to explore an abandoned military base, Alex is involved in an incident that leaves him contaminated with radioactive material, and he won’t stop growing until he escapes.  •Cock Growth •Huge Balls •Huge Cock •Hyper Cock •Hyper Cum •Hyper Muscle •Hyper Strength •Immobility •Muscle Growth •Muscle/Strength •Butt Growth •Increased Libido •Foot Growth •Gradual Change •Transformation •Voice Deepening •Getting Taller •Giants •Size Increase •Nonconsensual change •Infectious •M  Added Aug 2022 3,606 words 8,589 views 4.6 stars (25 votes)
• Reality Pack by Thorn  [  ]  What happens when the program you’re working on for school has a downloadable mod? You investigate it of course!  •Cock Growth •Huge Cock •Pec Fucking •Muscle Breast •Muscle Growth •Muscle/Strength •Butt Growth •Belly Growth •Gradual Change •Getting Taller •Plausible Size Difference •Getting Hairy •App •Age Difference •First Time/Virgin •Incest •Brothers •Father/Son •M/M •M/M/M  Added Nov 2020 Updated Feb 2021 15 parts 79,094 words 42,132 views 4.9 stars (34 votes)

• Sensational summer growth by OneLuckyGuy89  [  ]  Todd and Aaron return home to their hometown of Portland as changed men. Now it’s time for them to change the rest of the town.  •Cock Growth •Multicock •Straight to Gay •Muscle Growth •Man Scent •Butt Growth •Getting Handsomer •Voice Deepening •Getting Taller •Getting Hairy •Age Difference •Incest •Brothers •Father/Son •M/M •M/M/M  Added Apr 2022 Updated May 2022 3 parts 8,409 words 11,048 views
• The six pack by Cris Kane  [  ]  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.  •Cock Growth •Cock Shrinking •Huge Cock •Gender Swap •Butch-to-Fem •Other Mental Changes •Straight to Gay •Muscle Growth •Muscle/Strength •Butt Growth •Belly Growth •Increased Libido •Getting Handsomer •Gradual Change •Transformation •Getting Taller •Size Decrease •Size Increase •Age Progression •Age Regression •Race/Ethnicity Change •Getting Hairy •Getting Fatter •Destruction/Violence •Series •M/M •M/M/M  Added Sep 2018 9 parts 38,564 words 25,713 views 4.8 stars (13 votes)
• Size matters by BigManBigBelly  [  ]  An earnest and passionate top’s deficit leaves his bottom hook-up frustrated, but when the bottom lets slip his desire for more size, his wish comes true with ironic consequences. The word ‘grow’ becomes very triggering for him.  •Cock Growth •Huge Balls •Huge Cock •Muscle Growth •Butt Growth •Foot Growth •Gradual Change •Giants •Size Increase •Destruction/Violence •Humiliation •Nonconsensual change •M •M/M  Added Jan 2022 3,551 words 8,104 views 4.8 stars (13 votes)
• Spare parts by YellowJester  [  ]  After being disfigured in an accident, Al learns that he doesn’t need his old body or face when he can simply copy the best features of those around him.  •Cock Growth •Straight to Gay •Muscle Growth •Butt Growth •Increased Libido •Getting Handsomer •Gradual Change •Voice Deepening •Getting Taller •Size Increase •M/M  Added Aug 2022 3,378 words 3,825 views 5.0 stars (10 votes)
• Spice up your life by Musclesaber  [  ]  Roommates Sam and Collin try to return to a life of normalcy after the pandemic. Trying to have a get together with friends, Sam buys a new spice pack at the store that has some surprises in store for the pair.  •Cock Growth •Huge Cock •Muscle Growth •Butt Growth •Belly Growth •Getting Taller •Fourth of July •Set during the Pandemic •M/M  Added Feb 2021 Updated Aug 2021 8 parts 22,174 words 22,641 views 5.0 stars (24 votes)
• Spunk and brimstone by BRK  [  ]  Ty is fed up and needs things to change. Then his coworker, Derek, tells him about the little game box on his bookshelf that changed his life…  •Cock Growth •Huge Balls •Huge Cock •Hyper Cum •Muscle Growth •Butt Growth •Getting Handsomer •Transformation •Voice Deepening •Tongue Growth •Demons •Incubus/Succubus •Supernatural •Complete •Series •M/M  Added Aug 2022 6,263 words 5,578 views 4.7 stars (9 votes)
• Stories to tell in the dark by Thorn  [  ]  Sean discovers a book that is filled with some surprising stories.  •Cock Growth •Huge Balls •Huge Cock •Muscle Growth •Muscle Gut •Butt Growth •Belly Growth •Voice Deepening •Getting Taller •Size Increase •Getting Fatter •Inflation  Added Apr 2021 2 parts 9,685 words 13,681 views 4.9 stars (30 votes)

• Under control by Alakazam1988  [  ]  Rylan is enthralled as his roommate, Peter, seems to be growing all over—though Peter denies anything is happening, and no one else seems to notice either.  •Cock Growth •Huge Balls •Huge Cock •Nipple Emissions •Muscle Growth •Muscle/Strength •Butt Growth •Gradual Change •Getting Taller •Size Increase •M/M  Added Apr 2020 Updated Aug 2020 5 parts 22,139 words 32,564 views 4.9 stars (31 votes)

• What a dear deer boy by Thatbadwriter  [  ]  Eric’s undersized brother Jayden finally hits his growth spurt—then keeps hitting it.  •Cock Growth •Huge Balls •Huge Cock •Hyper Cock •Hyper Cum •Butt Growth •Giants •Plausible Size Difference •Size Increase •Human to Animal/Anthro •First Time/Virgin •Incest •Brothers •Hyper Pheromones •Anthro/Furry  Added Feb 2021 Updated Mar 2021 5 parts 12,430 words 19,143 views 5.0 stars (14 votes)
• WYRD: What You Really Desire by RDR  [  ]  Marco is sick of being a small guy, doing what he can to fix the issue. When hope seems lost, a pop up appears on his computer asking what he really wants as if it were going to give it to him. But what does Marco really want?  •Nipple Emissions •Muscle Breast •Muscle Growth •Voluptuous Men •Butt Growth  Added Apr 2021 1,478 words 6,859 views 4.8 stars (8 votes)