Same Tests, Different Scientist

Chapter 3: Stratch That, He's Great!

Sin, without hesitation arched his back with a lewd muffled moan.
"Mm-*gulp gulp*-mmh~~~!!"
He had never felt this before but Toffee could easily see that the cake batter cow was loving it.
Toffee paused the blowjob, removing the cock from his mouth.
"C'mon you whale! We still gotta get through the rest of this cake mix, I know you can eat faster!"
He kept working Sin's shaft with his hands as he berated him. "Mmm-*gulp*-mph~. Yesh shir~!"
Was all that Sin could work out of his fattening face as he had to continue on chugging it down. It soon got to a point where Sin was sucking on the hose and releasing cute lewd moans when he could. His gut was pressing on Toffee as Sin's cock quickly became completely lubed with his own pre. Sin's body grew heavier and heavier against Toffee's back, pressing into him more.
"You're turning into a proper cow now, plenty of heft to ya."
He teased the head of Sin's cock with his tongue. "Ahh-hm~~!"
Sin really couldn't say much due to the fact that he was still sucking down the sweet sweet batter. Every gulp sent shivers of pleasure down his entire body. He was loving every second of this! He began to grope his belly in a lewd manner to help increase the pleasure.
"At this point, it's hardly fair to call you a pig or cow. You really are putting the barnyard animals to shame, fatty"
Toffee teased his captive, jerking him off as he did so. Sin's cock began to pulse rapidly as he gulped more and more. Soon he let out a muffled moan and he let out his load all over the underside of his swelling gut and Toffee's hand. "Hmmmm, well that takes care of that. At least our mixture didn't have any unexpected results on your manhood."
He wipes his hand off onto Sin's belly and works his way out from under him. Purposefully nudging and bumping  Sin's mass as he did so. Sin tried his best to look over at the canister, his growing fat was making it hard to move his limbs.
"Mm-mph! *gulp gulp* mmh...~~?"
Was all he could truly mumble at this point. "Why don't you take a rest? I'm sure it can't be easy standing with all that fat on you."
The scientist shoved his weight into Sin, pushing him off balance. The test subject fell backwards onto his large ass, pinned down by the weight of his body. Sin landed and it made his entire body jiggle and wobble about. More specifically his thicker thighs and newly fattened ass.
"Mm-*glurk*-mmgh~~!!"
He went back to chugging and groping without complaining. Toffee casually leaned into Sin's massive gut, nonchalantly looking over at a meter where the hose was coming from.
"Well, unfortunately for you, pig, it seems you have almost eaten our entire stock."
*Another one of his mischievous grins flashed across his face*
"However, who knows how big you'll get once your body catches up digesting all those extra calories." Sin looked back up at Toffee somewhat scared but also, he had a huge blush across his entire face. It was obvious now that Sin wanted to be like this. He loved being a massive slob! He then smiled and sucked the rest out of the canister and spat out the hose.
"*BUURRPP!!* phew.... that was fun Mr Toffee sir!"