Extra pectoral muscles—sometimes three or four across, other times stacked in multiple rows (this is also called Stacking).
Related: Extra digits; Extra facial features; Multi-abs; Multi-balls; Multicock; Multihead; Multilimb; Multitongue; Multitorso; Replication; Stacking; Wings; Wristfeet.
Child of: Extras.
Top Stories: “Changing Nick”; “Mutation”; “Cool bracelet, bro”; “Metaboi”; “Enhancement program”; “Stop staring at me”; “You and I”; “Body game: Encounter 813”; “Hollyville”; “Hard5”.
Recently Updated: “Body game: Encounter 813”; “Photo stash”; “Hard5”; “Tuesday”.
35 stories found. Total word count: 382,950.
- Changing Nick by BRK AlwHard Cock XAbs XCock XHead XArms XLeg XLimb 3Legs XPec Rep Stack 2Gay MuscUp Musc SizeUp App Retcon Nonc Merg Nick’s computer starts offering him choices between one kind of transformation and another. He soon learns he’s been drawn into a strange conspiracy, even as the changes start to spread to friends, strangers, and secret allies. Added May 2013 Updated Apr 2020 16 parts 59,147 words 91,443 views 4.6 stars (34 votes)
- Coffee date by BRK CockUp Cock XDig XCock XHead 4Legs XArms XLeg XLimb 3Legs XPec XTorso Rep Stack Retcon Jeremy gets dragged to a blind date at a coffeehouse that seems to have an inexplicable effect on Jeremy’s body. Added Aug 2020 2,014 words 2,633 views 5.0 stars (5 votes)
- Cool bracelet, bro by BRK AlwHard CockUp Cock HyCock Self XCock XHead XArms XLeg XLimb 3Legs XPec Stack MuscUp Musc Retcon Sugg Inc Bro Shortly after acquiring a mysterious leather bracelet, Pete and his kid brother Quentin have a conversation that leads rapidly toward just how hung Pete is, and how horny that makes his brother. Added Feb 2014 Updated Mar 2018 5 parts 16,745 words 56,574 views 4.6 stars (45 votes)
- Gettin’ merged by Jefftaur XCock XHead XArms XLeg XLimb XPec Merg Added Aug 2009 3,207 words 16,573 views 4.5 stars (17 votes)
- Getting more than you bargained for by Tereshky CockUp Balls Cock HyCock XArms XLimb XPec Stack MuscUp Musc Taller Giant SizeUp Most people do their growing before the pose-down, but this bodybuilding competition is not what it seems. Added Jan 2013 2 parts 3,922 words 28,946 views 4.5 stars (10 votes)
- Glitch by BRK AlwHard CockUp Cock XDig XCock XArms XLeg XLimb 3Legs XPec Rep Stack NoShirts HyTongue TongueGr Retcon Inc Twins Undercover as a university student inside a thriving, all-gay digital community, Torin starts experiencing unexplained, universe-wide glitches that progressively and seamlessly change Torin and everyone around him. Added Dec 2020 Updated Mar 2021 4 parts 13,963 words 3,649 views
- Greg and Jesse by BRK CockUp Cock XCock XHead XArms XLeg XLimb XPec Rep Stack Inc Bro Merg Weed Greg and Jesse are already pretty close. But the addition of a little premium weed combined with a video chat session makes them even closer. Added Mar 2009 Updated Jan 2018 3 parts 6,991 words 27,670 views 4.6 stars (19 votes)
- Hard5 by BRK CockUp Balls Cock HyCock NipC XHead XArms XPec Stack HyMusc MuscUp Musc Hairier Tf Just before his debut as a replacement performer in an up-and-coming boy band, Ian discovers they have a strange backstage ritual with some very unexpected effects. Added Jun 2021 4,125 words 1,802 views 4.7 stars (6 votes)
- Hollyville by Tereshky CockUp Balls Cock HyCum XAbs XArms XLimb XPec Rep Stack Wings MuscUp Musc Tf SizeUp Tent Horror The sleepy town of Hollyville, Alabama finds that strange things are happening to some of its people. It’s one man’s job to find out, but is he prepared for the mystery, suspense, and life-altering changes to come? Are you? Added Nov 2019 Updated Feb 2020 9 parts 43,978 words 14,401 views 4.9 stars (16 votes)
- The hydrean dagger by Dakon XDig XCock XHead XArms XLeg XLimb XPec XTongue Jake finds a special knife that triples what it cuts off, and his boyfriend Todd becomes excited by the possibilities. Added Jun 2005 2,573 words 8,991 views 4.8 stars (6 votes)
- Me two by BRK XCock XHead XLeg XLimb 3Legs XPec Rep Inc Twins Merg Chris has some time off from his celluloid heroics as an A-list movie star and is going through fan mail when he finds a joke twin-making machine. Amused, he tries it out, with… unexpected results. Added Jan 2021 2,725 words 1,581 views 5.0 stars (6 votes)
- Metaboi by BRK AlwHard Cock HyCum XAbs XCock XHead XArms XLimb XPec XTongue Rep Stack MuscUp Taller PSD Retcon Swap Merg Tksg Series There’s a special clothing store that caters especially to the meta boi. If you’re their kind of customer you already know it—or you’ll soon find out. Added Jun 2010 Updated Nov 2017 8 parts 31,338 words 55,766 views 4.8 stars (16 votes)
- Mutation by BRK CockUp Cock HyCock XCock 4Legs XArms XLeg XLimb 3Legs XPec Rep Stack Everyone in Portia, Alaska has been grown thicker and stronger and made irresistibly beautiful, but none more than the teens in the high school. Geek genius Mr. Lewis tries to roll back the most extreme changes in Mr. Casey’s class as a test case, but the trial doesn’t go anywhere near as planned. Added Jun 2010 Updated Jul 2018 4 parts 9,583 words 65,336 views 4.9 stars (15 votes)
- Ramón the developer by BRK CockUp Cock NipC HyCum NipCum XCock XArms XLimb XPec Rep Stack 2Gay MuscUp Musc Taller SizeUp Series Ramón is used to having lusty, eyes-only encounters with the hot and hunky guys in his office, but today everything seems so much more intense, and a little eye-fucking isn’t going to be enough. Added Aug 2018 4,544 words 6,975 views 5.0 stars (5 votes)
- Read aloud by BRK CockUp Balls Cock XDig XAbs XCock XArms XLeg XLimb 3Legs XPec Stack MuscUp Musc Taller Series Timothy decides to use his favorite website’s new read aloud feature so he can concentrate on his jerkoff session and really get into the story. Instead, the story gets into him. Added May 2020 3,068 words 2,741 views 4.8 stars (8 votes)
- Remodel by BRK XCock XArms XLeg XLimb 3Legs XPec Stack On a modeling shoot in Brazil, Reese finds himself uncovering his body’s hidden potential—which apparently includes some unexpected extras. Added Mar 2020 Updated Sep 2020 2 parts 5,049 words 3,459 views 5.0 stars (7 votes)
- Dragon’s Horde: Retired by drinking by STrRedWolf AlwHard Balls HyCock XHead XArms XLimb XPec Stack Rubber Fur Alcohol Series Sometimes the best retirement for an actor can be the role of a lifetime. With the help of the Dragon’s Horde, an actor’s retirement can be a life-changing, and possibly squeaky, event. Added Sep 2018 3,170 words 3,733 views
- The trouble with Jason by BRK XArms XLimb XPec Musc App Joey is feeling a little overstimulated by all the competing transformations his hot friend and coworker, Jason, is being given by their bosses—especially since Jason himself not only is completely clueless that he’s being changed at all, but seems to flirt without knowing it, too. Added Jan 2016 4,501 words 9,831 views 4.7 stars (6 votes)
- Tuesday by BRK XDig XAbs XCock XArms XLimb XPec Rep Str Inc Twins Swap My best bud Kev and I have a secret. Okay, it’s a really badly kept secret—I grow extras. But when Kev starts to change too, we soon find out there are lots of secrets at my school. Added May 2003 Updated May 2021 7 parts 13,431 words 25,203 views 5.0 stars (9 votes)