Muscle Growth Brother Stories

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Stories of changing sizes, growing bigger or shrinking smaller

by masterfulmastus on Dec 20, 2020
Fetish

This is a branching series with a focus on transformations or size changes in stories. Predominantly growing and expanding in some way, but also including shrinking, size draining, size transfer, and any other size play related fun. Size changes can happen any number of ways depending on the path you choose and who is growing and changing. Random growth spur...

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Size Matters

by idahoboy on May 5, 2015
Science Fiction

Adam rushed into his room after school. His dick was already straining in his pants. It seemed like it was getting harder and harder to make it through a day of school without jerking off. The young man had taken to blowing a load in the toilet at lunch. Today, he couldn't find an empty stall before the bell rang. The boy dropped his pants wrapped his hand a...

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Contagion 63X - Viral Transformation

by Aroband on Feb 20, 2020
Fantasy

From the records of Advanced Bio-hazard Research Facility Psi Omega - Location **Redacted** ---===Virus 209-q===--- Codename: 63X Virus 209 was designed as a way to naturally incapacitate the human body by temporarily drastically increasing the production of certain hormones in the body. Strand q was a dangerous outlier in 209's evolution that went far beyon...

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Growth-XX

by FlatCap90210 on May 20, 2019
Science Fiction

James felt as if he was going insane. It was summer, the sun was shining and he was at the beach ogling girls. Tits of all shapes and sizes surrounded him, wrapped in bikini tops, one pieces and other pieces of fabric of varying coverage. James' heartbeat pounded in his ears and throbbed in his crotch, digging a furrow in the sand beneath him. He was lying o...

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The Demonic Idol

by bob10 on Jul 31, 2013
Fantasy

Life didn't offer a lot of joy for Lydia. Her only daughter was one of them. In fact it was the only thing her former fiancée. Unfortunately the bastard had left her after her pregnancy. She raised her daughter Mary alone, her parents didn't give a lot of help. She thought about finding someone but she failed. Now at 45 she didn't have the mind and the body...

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I Wish For... Ch. 03: A Swelling Sensation

by mistyfdfa on Apr 25, 2018
Transsexuals & Crossdressers

A Tale of [The Far Shore] continuing the story of Jeanie, a fitness nut whose wish to be a miracle worker resulted in her becoming a jinni. Summoned to grant her first wish, this chapter features women getting buff, female to altersex transformation, a character becoming a centaur, size play themes, sapphic romance, shared sensations, unexpected outcomes, an...

The Suit

by Tunathetitan on Sep 26, 2017
Fetish

You are Simon Richards, you are 22 and work a part time job in the mail room of a corporate office not for from your home. You live with your older brother, younger sister, and parents. Your home is pretty large, spacious backyard with a pool. Your room is on the second floor and overlooks the driveway and is directly across from the bathroom. You are a pret...

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Megan Ch. 14-15

by djubre666 on Sep 14, 2017
Fetish

Chapter 14-Final "Where is the stuff..." Megan spoke quickly, she was referring to the sample container they sent for her from the lab. "On the kitchen table" I said, and she nodded confirming, quickly rushing out the door. She did try to open the door using the doorknob, but in her hurry she simply tore the whole thing off, and then ripped the whole doo...

A Love High in Protein

by mistyfdfa on Sep 16, 2017
Sci-Fi & Fantasy

Warning: this massive, sexually explicit story, featuring a couple consisting of a huge, burly guy and a petite, willowy size queen, is about her achieving her dream of somehow growing larger to the point that she out grows him in every way imaginable. If things like a size difference fetish, muscles growing on both men and women, a woman becoming altersex,...

The Bimbug

by Testytesterton on Jun 17, 2020
Science Fiction

The world changed overnight with the first cases of the Sexually Infected Subjects Spreading Infections Exponentially Syndrome, or SISSIES, became known. At first it sounded like some urban legend, men turning into hot, horny, hung shemales and spreading the infection to any man that came in them...or any man they came in. It was only after you saw video evi...

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