Marco grinned slyly. He picked up the book and found a spell. He smiled to himself as he looked down at Francisco and read away.
"If his is too small, to give you pleasure,
read this spell at your leisure.
The biggest dick you've ever seen,
his member will grow till obscene."
Francisco looked up in confusion. "What was that spell?" asked the miniature man. Marco smiled "Oh, you'll see." Francisco felt a tingling in his groin. Looking down at his dick, his eyes went wide as his 3 inch (well, in proportion to him 3 inches) dick began to swell. It grew larger, and larger, and larger. Soon, it actually was 3 inches large, the same height as him. It grew thicker, longer, heavier. It rested on the coffee table before him. "What are you doing?!" Francisco shouted as his dick grew larger. Marco shrugged, lifting his stomach to reveal the nub on his groin. "Well, if you're stuck that big, and I'm stuck this fat, neither of us will ever get laid again. Even if you wanted to, I'd need to shrink my dick till it was big enough for you to use, but it'd get lost in my groin fat. I'm making yours big enough for us both to enjoy." He said, then put his stomach back down.
Francisco stumbled back , his now 6 inch dick pushing him onto his butt. To him it felt like it was 12 feet long. It grew a few inches larger, 9, 10, 11. It was enormous to him, and big by a normal person's standards. Marco picked the tiny, immensely endowed man up, and stroked the huge dick. It twitched. Marco licked it. It began to grow longer again, but this time it was growing thicker and harder. Slowly it inched up bigger and bigger. 13, 14, 15, 16, 17 inches. The huge dick hung from the tiny man. Francisco felt like he had a 34 foot dick. Marco grabbed the base of the huge shaft and leaned back, exposing his fat ass. He pulled Francisco down and pushed the huge dick into his ass, and pulled him in and out. Marco's fat ass felt soft on his shaft. Francisco felt amazing as Marco used his huge dick like a dildo. Every movement was magnified. Marco moaned loudly, as did mini-Francisco. It was nearly unbearable, and soon, he shot his load.
------
Marco cleaned up, and francisco laid back, letting his huge erection shrink down to it's "normal" 11 inches. "That felt amazing!" He shouted. Marco chuckled. His whole body jiggled. Francisco rubbed his chin. "You know, you being fat... that felt strange, but so hot!" . Marco picked up the book. "You like me being fat, huh? Then I guess I should try this next spell."
Marco began to read.