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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.

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

Stories found: 51.

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 greenhouse effect by Godzilla  CGrow Balls Cock Infect    Added Feb 2006  •  2.4K words(2)
  • Growing pains by Anonymous(4 parts)CGrow Infect Musc MGrow    Added Jul 2002  •  4.7K words(4)
  • In the sack by Neltharion5  Cock Infect Musc MGrow  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 Musc Gut 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(3)
  • 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(22)
  • Quarantined by MuscleNexus  Infect Musc MGrow 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(11)
  • Unbound Beast Inc. by an0n12  Cock Infect Musc MGrow  Jeff is working out late at night and encounters Ian who has substantially grown since he last saw him; Ian decides to be cocky and show off/seduce Jeff not taking into account the how effective the drug he's taking would be when he cums. Will it be too much for Ian or will he let his arrogance and lust get the better of him?  Added Mar 2017  •  4.0K words(13)
  • Visiting home by Wicked(2 parts)Dad Cock Infect Musc MGrow Grow  Asher spent his entire first semester working out and gaining some serious muscle, but when he returns home for winter break, he doesn’t realize that he’ll be the one amazed by how much someone can change.  Added Jan 2016  •  Updated May 2016  •  6.8K words(12)