Sammie concentrated on absorbing Monica's fat. She watched in amazement as the obese girl's bulbous body began to shrink slightly. Suddenly Sammie felt her own body changing. She glanced down and saw that she was growing softer, her belly, tits, arms, and legs swelling in size with fat siphoned from Monica's ample body.
Soon, Sammie had absorbed 250 pounds of Monica's fat. Sammie's 350-pound body strained against her tight clothes that had been sized for a twig of a girl. It occurred to Sammie that she should probably stop... but she didn't want to. What was the harm of taking just a little more? After all, the world had thousands if not millions of 350-pound girls. Sammie wanted to impress people with her girth!
Sammie held onto Monica's hand and kept concentrating. Soon, she'd taken 400 pounds from Monica's fat reserves. Sammie felt her clothes starting to rip as she ballooned to 500 pounds.
"What are you doing?!" Monica gasped as she noticed how much she'd shrunk. She was down to 500 pounds from her original 900! Her clothes hung comically loose from her deflating body.
"I just wanna get a little bigger!" Sammie pleaded, clamping her chubby fingers tight around Monica's hand. As Sammie's thoroughly obese body plumped up larger and larger, her torn clothes finally gave out, exposing her mountainous belly and bulbous breasts.
Monica wept as she shrank, her jiggly softness evaporating as Sammie's flab inflated. She never should have agreed to donated even an ounce of her precious fat. Fuck what the doctors said!
Deeply aroused by her swelling, Sammie began to masturbate with her free hand. When she finally came, squirting her love juices all over her beanbag, she let go of Monica's struggling hand as the bliss overwhelmed her. Once her orgasmic haze cleared, Sammie took stock of her surroundings. She had ballooned to 915 pounds! Her naked body was a mountain of amorphous, sensual, jiggling fat! She could no longer stand, just wobble.
Monica, meanwhile, was reduced to a meager shadow of her former self. She was even skinnier than Sammie had been when she'd come in! Her scrawny, bony body didn't seem to have an ounce of fat on it. There was no way she weighed more than 85 pounds now. The skinny girl stood up (probably for the first time in months), tears streaming down her heartbroken face. She felt her tight, flat stomach and ran her hands over her non-existent breasts (they were little more than nipples now). Monica's tent-like clothes had all slipped off of her, leaving the bony girl exposed and vulnerable.
"Wh-why did you DO this to me?!" Monica sobbed as she sank to her knees in grief, mourning her lost rolls of fat.
"Uhhhh... sorry?" Sammie said, her chins wobbling as she talked. "I just wanted to be huge like you."
"Huge like I was, you mean!" Monica bawled. "You've fucking ruined my body!"
"Hey, there must be someone around to donate you some new flab, right?" Sammie laughed nervously.
Sierra and Krystal ran up to Sammie and buried their hands in the girl's new rolls of gelatinous fat. "Whoa, Sammie, check out the new you!" Sierra gasped. "You're a freaking whale now!"
Sammie smiled in delight. She was in heaven. "Amazing, isn't it?"