You decided you wanted to get a little more close to nature with this, after all what animal were all slobs akin to.
You closed your eyes, and targeted Ryan, the tall blonde.
"Mate, bet I can down this faster then you can" he said. The other two, goaded on, picked up there cans.
"Your on mate" said Curtis, as they began to drink.
Ryan began to change first. With every sip, he began to grow. Fist it was just a small gut, then a round belly. Soon, his ass began to widen and chest inflated to saggy yet plump man tits, his arms and legs growing fatter as well. He grew fatter and fatter till he was a good 450lbs, his tracksuit splitting at the seams, his shirt riding up to expose his fat belly, his neck disagreeing behind fat and multiple chins. He had also grown to the hight of 6"3.
Curtis, changed next. He began to grow a giant ball gut, the size of a beach ball. His ass fattened into a freakishly sized rump, splitting his chinos down the backside. He then grew basket ball sized tits, with huge puffy errect nipples. His arms and legs grew fatter as well. Overall his shape was more effeminate. like a fat woman's.
Luke then began to transform, growing shorter and wider, to about 5"4, with a fat bear belly that hanged over his crotch. most of his shirt buttons had popped open to show his tits and belly where coated in thick dark hair. His ass became wide, splitting his school uniform pants.
"Woah" said Ryan, examining his new body "What the fuck was in that beer?"
"I dunno bruv, but I think I like it" said Curtis, bouncing his tits up and down in his hands "Kinda hot"
"Oi, check out how hairy I am" chimed in Luke, rubbing his fat belly"
'Now for the next faze' you thought.
Ryan suddenly went pale, as he felt a gurgling in his gut.
"You alright bruv" asked Luke. Suddenly, with an incredibly loud burst of flatulence, a torrent of brown, pungent goopy shit began to spray out of Ryan's ass onto the floor, creating a puddle,
"Awww what the fu-oink"! exclaimed Curtis, before more confusion spread on his face, as he wondered why he said oink. Next thing he knew he was dragged to the floor into the puddle, and was burring his face in the brown slurry, eating as much as he could.
Luke looked on in horror as he watched Ryan lay down and role in it, still spewing shit in a continuos stream. Then he watched as a curly pig tail sprung up from Curtis's backside, before another stream of filth erupted from his asshole, straight onto Luke. He recoiled in horror at first, but as he felt some splash into his mouth, he paused
"Fuck man - ooink - this tastes great!"
Ryan looked up from his feeding, the brown slop covering his mouth.
"I know bruv, - squeal-" he said before diving back in. Luke began to hungrily lick Curtis's big voluptuous behind. Soon, although began to grow more and more pig like, there ears changing, noses becoming snouts, feet becoming trotters. Curtis began rubbing shit into his dick when he realsied it was shrinking, turning inside out, before becoming a fat sow pussy.
"Sqweeel, yo, I gotta pig cunt,- oink-" he announned with glee. Ryan, who had rolled onto his back, showing his short, incredibly thick pig cock.
"Nice bruv, hop on then"
Curtis crawled on all hands and fours, mounting Ryan's huge gluttonus frame, pushing his shit coated cock into the sow pussy, and began bouncing up and down.
"Aww -oink- mate, this is sick bruv" said Ryan with pleasure. "You gonna do the work though, i'm -swqweee- to fat to fuck ya mate"
"Yoooo, oink- totally hot" said Luke, gripping his pig cock. "room for one more?"
"Sure, Curt is well into it" said Ryan, watching Curtis's tits bounce.
Luke sidled up and stuffed his dick into Curtis's asshole and began to fuck him brutally.
You watch the slobby swine boys gleefully fucking, thinking of what to do next.