>>8059 (OP)I like this premise so I wrote a story
A full moon hung over the Goblin mountain fort, shimmering on the river at the base. The apex of the fort was a tower, and here we see a petite thief scaling the shadowed side of it. Infiltrating had been easy, as the security comprised of drowsy guards and lazy patrols with many blindspots. Our thief's target was a room atop the tower, supposedly filled with treasure the bandits had stolen. What exactly was inside was unknown, but the goblins had raided nearby towns for decades, and it was rumored that the price of just one of items inside could keep one well-fed for a lifetime.
Finally reaching the room, the thief peeked in through an open window. A pile of golden trinkets and various artifacts glowed in torchlight. Not one to be distracted, she scanned across the room checking for any guards. Empty. A small smirk crossed her face, and she began to twist her lithe body through the opening. It was tight, but not tight enough for her starving frame. Landing noiselessly, her hood was pulled back and revealed a mop of brown hair, pointed ears, and gaunt elf cheeks.
Hungry eyes perused the room. She had to be careful, as she would leave here heavier than she came, and should not take on too much excess weight. A stifled yawn came from outside the door to the room, alerting the thief to get busy with the burgling. A necklace here, a ring there; soon her inventory was full. She made for the window when a small, blue orb caught her eye.
Thin fingers pulled it up, and an odd but pleasant feeling entered her body. Sore muscles were soothed, dry eyes became wetted and clear. It must be a mana stone, she mused. She had no need for mana, as she was blunt in the magical arts. Regardless, it was valuable, such as this intoxicating bliss. The elf, in her stupor, knocked over a goblet. She froze. Murmuring and a jingle of keys came from the other side of the door, and the thief knew her time was limited. Finding all pockets currently full, she popped the blue marble into the cheek of her mouth, and started exiting through the window.
Her momentum stopped as her hips caught on the window. There was much twisting and contorting, but to avail. Had the window shrunk? How was it big enough for her to get in, but too small to exit? A hand grabbed her by the belt and yanked her away from the exit, and in her surprise she gasped and swallowed the mana stone. "Jus' whaddaya fink yer doin, fatass?"
A goblin stood over her, a wineskin in one in hand and a dagger in the other. Fat? She wasn't fat. Going hungry was practically a constant in her life, how could she be f-- Our thief's belt felt somewhat tight. A small muffin top bulged beneath her button shirt, on top of wide thighs lacking tone. Adrenaline replacing shock, she grabbed a nearby trinket and thrust it at the guards's head. He grunted in pain as he stumbled backwards, and she followed up with bashing him unconscious with another of the room's heavy treasures.
The threat delayed, the thief had a moment to check in on the new-found squish. It was as if a wad of dough had erupted from her torso, the bottom button of her shirt straining. It popped off suddenly, revealing a deep belly button...It was growing. Confused, the elf thief checked which stolen trinket could be causing this, although she managed to fit a grope or two of her enlarging chest. She discarded them one by one, but the tightening of the outfit did not stop. Having emptied her pockets, the elf pouted her now chubby cheeks, before remembering the marble she swallowed.
A vague memory of her grandma came to mind, that mana could be stored as fat in the body. Currently, there was a source of mana was nestled in her stomach. The seat of her pants blew out, causing a squeal of surprise, the cool air raising goosebumps on her exposed behind. Harsh barking and echoing footsteps came from the tower's stairwell. There was little time. She made for the window, but this time she got even less far. Her muffin top smushed against the sides, her bottom wobbling as she shimmied and struggled. "Oh no, oh nonono, NO"
Panic began to set in as she pulled herself out. She had to think of something, but all the thief could do is start waddling in circles as the footsteps from the stairwell grew louder. Her arm fat split her sleeves, bingowings puffing up from the slits. Her breasts were straining against her shirt, and another button popped off. She couldn't fight like this, not to mention how heavy her body was getting. Gravity soon one the battle against her muscles, and she fell backwards with a plap onto her bottom. Her belt was getting painful now, and a forming double chin was making it harder for her to look around.
The footsteps were almost here. All she could do is try to get up, but failed and fell down again, resulting in nothing but more jiggles, and another button pop. Her arms began to raise, love handles and upper arm fat forcing them upwards. Her belly and chest continued to swell, popping a button...then the last button, pulling the shirt free. The now double belly strained her belt painfully, the leather creaking worryingly. As the first guard rounded the corner, the belt could take no more. "WHO GOES THER-" The buckle flew to the goblin's forehead, making him fall backwards, crashing the other guards back down the stairwell.
Our thief made a small coo of relief, the source of restriction gone, but the swelling was unrestricted now. Her belly spilled further onto her widening thighs, her cheeks were swelling up, obscuring her vision along with her breasts puffing larger. Pointy metal trinkets pressed up against her bottom and thighs as the rolls of flab oozed across the room. The fat was truly piling on; she billowed and grew, warm and soft and...oh it felt so good. The feelings of satiation, of a full meal, it felt good. Hardening nipples began to get wet. "Oh...OHHH..." she realized now that she was touching multiple walls, and the ceiling was fast approaching. Somewhere, an alarm bell rang.