The Hatchling (Gallus, part 6)
The hen groaned, feeling the odd mass shifting and wriggling within, her internal muscles trying to position it and the human still desperately trying to move against the confining grip.
The Mounting Pole
The bronze mass shifted as a massive hided head lowered down, the huge azure eye whirling in serene speculation as it looked the two over.
The Theft of Lykron
The hard bone that grew into it kept it pointed out from his flesh and the mass shifted, becoming more pointed than blunt and wetness engulfed him as the flesh of his new sheath snugly fit around him. it was like a warm hand covering his exposed core.
Kioga 2: Depend and Dependability
The wolf suddenly sat up as a solid mass shifted below his stomach. a whine escaped his mouth as his tail shot straight out behind him and a thunderous fart pummeled the table below through his padding.
Rare Earth, Common Ground: Dinosaur Planet - Part I
Karth felt her body mass shift about. her shoulders broadened. her hips narrowed. her once feminine heat scent turned musky. the wolf opened his eyes as the dominant masculinity crept into his nostrils and stirred his flesh.
Overlook Falls
She wiggled her hips back and forth to feel his bulbous mass shift and throb inside her, the firm knot filling her like a gravid hen as he pumped burst after burst of seed into her.
Test Subjects 02-16
Every tendril that extended out to pull the rest of the symbiote along, every undulation of its mass shifting within its membrane, every subtle shift in colour and texture as it found its way around her.
Macro Park Pt. 5
Meanwhile off on a small island north of the main macro island, could be found a handsome little mouse, laying back on a huge expanse of white soft fur, smiling as he felt the warm mass shift a bit under him.
Chapter 14- . . . Are Live Fire
He gained mass, and that mass shifted him from two legs to four. his body swelled, and the fur he had was shed, once more becoming crimson scales. he felt, distantly, wings erupt from his back.
The Hunted Diaper Retreat Chapter 4
Roddy yowled in pain, squirming as he felt the wet sodden diaper's mass shift up and down against his kitty prick. his clothes were gone now, leaving him dressed in only his diaper, as he watched shimmery fur spreading along his chest.
Commission: Long Live the King pt 2
The stripped mass shifted and moved as the zebra eyed him curiously. one of the equine separated themselves from the herd and trotted over towards him. the proud stallion tossed his head and squealed out a laugh, "well, as i live and breathe.
The Institute
I cringed as i felt the mass shift, but the lion just poked my belly teasingly. "hey, not my fault you don't go regularly," he said, and started untaping the diaper.