The giant moaned and held onto the stall's walls.
John expected to be flooded, but was surprised to hear a hissing sound. Before he could turn to find out what it was, he felt a stream of gas shoot up his ass and force its way to his belly.
'Of course, the bathroom!' John thought to himself and smiled. 'Now I can give this bozo a taste of his own medicine.'
While John was thinking of his revenge, the giant continued to pump John up. As his balls deflated, John started to grow in size. By the time his ball sack was back to it's original size, John had returned to his six-foot frame. Still lost in ecstasy, the giant had yet to notice this revelation, or the fact that he was still emptying himself.
John smirked when he realised he had returned to his normal state, but soon began to panic. He could fell himself starting to inflate again!
As the giant's body began to shrink, John began to swell. Slowly his gut rounded out as it did before. This time, John was afforded a view free from clothes. He could see his belly return to a Santa- like jelly and continued to bloat past any beer gut he had seen back home. He could feel the gas push against his skin, and fly back down to his ass cheeks. They too, began to swell like balloons, and inched back towards the not so large giant. The gas shot down into his legs and his thighs grew and quickly touched each other. The gas continued upwards to his chest. His pectorals rounded out, losing a majority of their definition but avoided rounding out like women's breasts and didn't sag like most overweight men. His arms quickly imitated his meaty pecs, both becoming thick and muscular, but looking softer.
When his beach ball sized ass touched the giant cum dwarf, it quickly startled him out of his daze.
"What the fuck is going on?" John's ex-jailor squeaked.
"This is all your fault!" John was worried, the stall was now a little too small for his comfort. "If you hadn't gone and done this, we wouldn't have had a problem!" John's gut was now pressing against the toilet uncomfortably. John backed out the stall, managing to only just squeeze his wide hips and love handles through the door. The ex-giant was still attached to his ass, pumping him full.
"Aw go shove it up your a-" before he could finish, a loud slurping nosed interrupted him. John could feel a heavy suction in his anus, and the giant disappeared up his hole. John turned his head and looked in the mirror, the giant was gone.
He turned for a full, frontal view assessing the impact of his latest adventure. With the giant’s departure up his ass, the inflation had stopped, leaving John just as bloated as before.
"I look like the nutty professor," he flexed his arms, "’cept maybe with a bit more muscle." He looked at his face and found that like before, it hadn't inflated with the rest of him.
He went back and got his clothes from where the giant had thrown them. Putting them on, he found that they were once again snug and clung to his gigantic balloon of a belly.
Looking down he found a key.
"Must have been for that dude's locker. Maybe he has some clothes or something..."
His stomach began to grumble once more and John released a small burp...