Growth Day
Now the wolf was even bigger than any of the bodybuilder furs they saw earlier. when kyuu tried to get onto the bed, the bedpost creaked loudly; libra could only imagine how heavy the wolf was, now that he was stacked with all that muscle.
Under The Moon
Novra's body bulged and thickened with power, muscles filling up every spot. the straps began to stretch even more under the constant pressure of the feline's swelling muscles.
Swoleverse: Manual
Something more catered towards the lovers of big muscles and maybe a tiny bit of muscle growth introduction:- an all-male world inhabited by hunky, buff men of various races and sizes, from lean and fit to hulking massive.
Filling the Nest [COM]
It took some teasing before he was allowed access between the other man's muscled cheeks where he found that delicate ring of muscle winking at his impending entrance.
Paradigm Rift [TSR]
His eyes had clamped shut as he let his fingers roam around his blossoming bulk, experiencing his muscle fibres tearing and repairing themselves in an instant without needing to see them.
Atop the Food Chain [PTRN]
One of the first things that legoshi realized was that, despite there not actually being any muscle present, the leviathan rod was strong as hell, giving him trouble as he tried his damndest to angle the tip towards his mouth.
Paradigm Rift [PTRN]
Each one of his globes had grown heavy with delicious muscle mass, easily able to outweigh what he used to when small.
Get Your Pump On [COM]
The tensing muscle mass jostling him around elicited a loud moan out of him as he comprehended just how strong his friend really was.
Exponential Growth Ch. 1 [COM]
The lupine was an actual muscle monster now at just over nine-hundred-and-fifty-pounds and eight feet tall, though he certainly didn't act like it.
Tales from the Nexus: Dawn of the Dragon (Teaser)
Of his brothers under raziel, there was no contest that he was the most muscular and perhaps the heaviest. and all that weight was muscle, after all.
Curiosity Smothered the Lion
The entirety of banjo's body expanded in every single direction; width, height and muscle size. everything about banjo swelled in size at a rapid rate.
A Change in Perspective [COM]
Oh, how he adored that his employee's gut hadn't vanished, merely taken on a new life as all fat that used to be there became replaced by densely-packed muscle mass.