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Whatever change happened to you can also be spread to the people you have physical or sexual contact with. Often happens through transmission of semen (specifically, something along the lines of “my cum makes you grow”) or sweat, but can involve methods as innocuous as kissing, or smelling the subject’s potent musk.

Kinds of “Infectious” stories include:

    Other tags that also fall under the category “Partner-Related Changes”: Absorption, Body Swap, Hyper Pheromones, Merging, Shared Body.

    Stories found: 66.

    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 Infectious:

    • Geno-type by Ziel(34 parts)CGrow Cock HyCock Infect  While on a camping trip, Tyler makes a half-assed wish on a shooting star. Not only does he get his wish, but it begins to affect those around him as well. Maybe he should have been more specific? An ongoing saga of hyper growth and the weird social situations it results in.  Added Dec 2012  •  Updated Feb 2016  •  144.3K words (24)
    • The good freak by Also Known As(33 parts)Hard CGrow Taller Grad Balls Cock Cum Infect MGrow Musc Grow  Kevin Peters is a cheerful, very fit young man who happens to be getting bigger and hotter in every way, much to the bemusement (and secret arousal) of his doctor. Soon the guys around him are growing too, and Dr. Donaldson discovers even he’s not immune...  Added Nov 2002  •  33.5K words (11)
    • The greenhouse effect by Godzilla  CGrow Balls Cock Infect    Added Feb 2006  •  2.4K words (3)
    • Growing pains by Anonymous(4 parts)CGrow Infect MGrow Musc    Added Jul 2002  •  4.7K words (5)
    • Gym maniac over his head by MuscularEmperor  CGrow Viol Cock HyCock HMusc Infect MGrow Musc Nonc Rape Grow  Alexander discovers that the sweat and sperm of bodybuilders affects his own body, which begins a dangerous and destructive obsession.  Added Jan 2020  •  3.3K words (13)
    • Gym parasite by Aphon  CGrow Balls Cock HyCock Infect Nonc 2Gay  When a failed experimental piece of parasite goop finds itself in a gym, it must spread itself quickly or die. Its means of transmission has some huge side effects, whether you like it or not…  Added Dec 2019  •  1.7K words (11)
    • Huge changes: Book two by RdyRoger(2 parts)CGrow Hair Balls Cock Infect MGrow Musc Nonc PSD Grow Series  Jason and Todd decide to help Mason, not suspecting that Mason will get an extra helping of wishes, or that Mason’s fantasies of love and growth will start affecting more than just his partners.  Added Dec 2017  •  9.9K words (7)
    • Hulk hunter by JayPat(2 parts)CGrow Viol Giant Cock HyCock Infect XAbs MGrow Musc Nonc Grow Tf Series  Hunter has dedicated his life to tracking and neutralizing the hundreds of huge-growing hulks that have been terrorizing small towns for twenty years now, and he’s damn good at what he does. But when he gets to his latest sighting, he finds things aren’t going the way they usually do.  Added Sep 2018  •  11.1K words (10)
    • The hulk pill by JayPat(5 parts)Cock Infect MGrow Musc Nano Grow  The only thing weirder than your buddy Boz offering you a “hulk pill” would be for it to actually work.  Added Oct 2012  •  29.5K words (22)
    • In the sack by Neltharion5  Cock Infect MGrow Musc  Brian finds a magical backpack that uses magazines as fuel to transform him. Soon, he realizes that his enhancements are sexually contagious, making his sex partners hotter. What else will he discover about the magic sack?  Added Mar 2017  •  3.5K words (4)
    • It’s magic by TylerGermany(2 parts)Infect Tf    Added Apr 2014  •  2.1K words ()
    • Jake: hand-drawn giant by spacevlad(7 parts)Infect Gut Musc Grow  Drawing massive, muscle-hunk football stars seems like a safe enough hobby—but what if your drawing takes on a life of its own?  Added Sep 2009  •  11.8K words (5)
    • The journal by Braun1(11 parts)CGrow Hair Balls Cock Infect MGrow Musc Grow  An ordinary college guy finds himself changing after a steamy encounter with a hunk named Brad, and decides to start documenting everything that’s happening to him.  Added Feb 2003  •  30.5K words (7)
    • Porn can be healthy by Egi(2 parts)CGrow Cock HyCock Cum Infect  Zack is a healthy, horny young man who, like any other boy, likes to look at porn. Always one for novelty, Zack comes across the perfect website for him and his needs!  Added May 2017  •  8.7K words (26)
    • Quarantined by MuscleNexus  Infect MGrow Musc Nonc  Devon is excited to hear his lover is returning from his overseas deployment early, after escaping the outbreak of a strange virus that put the rest of his team in quarantine. Only, Scott doesn’t seem to be quite himself…  Added Aug 2018  •  1.9K words (12)
    • Sam and Bolt by Alakazam1988(11 parts)AgeDiff CGrow CumInf Dad Hair Taller Balls Cock HyCock Cum Infect NipC NipCum Self Grow  Sam’s father, Bolt, shares with his size-hungry son the secrets of becoming truly huge.  Added Sep 2016  •  Updated Dec 2016  •  48.2K words (49)
    • Santa’s big surprise by Silverfox Dad(3 parts)Xmas Infect MGrow Musc Grow Series  Jeremy has not only been obsessed with Santa, he's seen him and knows he's real. So when a friend at the gym gives him a muscle-growth supplement meant to give him confidence enough to talk to his beautiful bodybuilder crush Marco, Jeremy decides instead to give Santa a gift of his own.  Added Jan 2017  •  7.6K words (10)
    • Side effects 2000 by Braun1 and Z(31 parts)Hard CGrow Cock HyCock Infect MGrow Musc Self Grow  Mike and Jan begin an odyssey of muscle, growth, transformation, sex, and love.  Added Jul 2002  •  Updated Sep 2018  •  126.7K words (4)
    • Sk8r dreams by Reaver(19 parts)AgeDown CGrow Cock Infect Mind Nonc Race Rep Retcon Tf 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  •  58.8K words (14)
    • Support line by BRK(3 parts)Hard CGrow Cock HyCock Infect XArm XCock XLimb Rep  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.  Added Feb 2012  •  Updated Nov 2013  •  7.5K words (9)
    • Sweat it out by Egi(2 parts)CGrow Cock Infect Scent MGrow Musc  Working out is hard enough when you're scrawny and shy. Sometimes you need a partner to help fill you out with some unconventional methods.  Added Jun 2017  •  8.2K words (9)