"Well I think I got something here, son," Thomas said.

"Use it, dad! Come on! I need more FAT!" Perry groaned as he squirmed as much as he could, causing his body to ripple.

His dad nodded and started to read the spell. Perry didn't know it, but his dad was reading off the spell that would add any amount of weight to his fat ass. The obese slob merely waited for the effect, nearly drooling at the thought of being even fatter. He felt a tingle in his giant, hairy butt and groaned. The tingle grew and grew as he started to feel his butt expand bigger. It spread out wider, pushing his hips bigger, and also inched it's way back. The fat bunched up as his fat ass cheeks grew bigger, pushing up his back fat as his ass started to expand up his back.

Perry groaned and closed his eyes, "Mmmmn, dad... ohhh, thank you, dad. Oh, my butt... my butt feels so FAT, so HUGE."

A soft grunt escaped Perry as he released another huge fart. It burst out as a quick blast that ended before an even bigger one started to rumble on. His huge ass quaked and rocked with the force of his fart that grew deeper as his ass grew bigger. Perry moaned from it and tried to push out another. It didn't take much coaxing for one to rumble right out causing Perry to moan from how good it felt.

His butt finally stopped expanding with the cheeks pushed halfway up his back and about 7 feet out behind him. His hips were immensely wide, forcing him to be pinned down even more. It'd take a team to move his butt at this point. Perry opened his eyes and panted softly. This was absolute heaven.

"How much did you add back there, dad?" he asked softly.

"Hm... I initially thought about 500 extra pounds. I may have added a few extra for you," Thomas chuckled.