“So tell me, why is this a good idea again?”

“Oh hush and just follow me.”

Sonic wasn't really following Kit though. It was more like Kit had grabbed Sonic's arm and was literally dragging the blue hedgehog along.

This had gone on for a few minutes, which was much too long for Sonic's liking. Fortunately for him, their destination was dead ahead, what looked to be an odd lake. 

It was odd of course, because it wasn't there a day before and it certainly hadn't rained. Beside it was what remained of a smaller, now dried-out lake, but there was no drought to speak of and it was there yesterday. It was as if the lake decided to pick itself up and move somewhere else.

Kit finally let go of the blue hedgehog's arm and pointed to the brand-new body of water.

“Check this out! I hear some chemicals from Eggman messed up this place.”

Sonic wasn't without curiosity: he walked over to the dried-up lakebed and took a small whiff. He cringed and plugged his nose.

“Well they certainly smell bad, ugh! Did he dry up the lake or something?”

The brown hedgehog was ever the scientist and held up two vials of odd-colored liquids. “I collected samples from both lakes and found out some interesting properties.”

She held up the vial of dark blue liquid “This one seems to replicate itself and turns its composition to that of water,” then she held up the vial of light green liquid “and this one decomposes water into nothing.”

Sonic scratched his forehead, “Ya know science isn't exactly my strong suit. Why didn't you bring this up with Sally?”

Kit giggled.

Sonic should have known that this was a bad omen, but unfortunately he had glossed over this subtle hint. Kit walked up to Sonic with the dark blue vial of liquid.

“Well...,” she said, her voice quieting, yet sounding more devious at the same time “I'd thought to test it out...”

Sonic blinked.

“...on you!” Kit shoved the contents of the vial down Sonic's throat, causing him to sputter and stagger backwards.

He clutched his stomach and coughed, almost to the point of vomiting. “Ugh, geez! That stuff is nasty! What th' heck didya do?!” 

Kit simply placed the other vial aside and sat on a rock casually, crossing her legs. She had waited all day to see what would happen next.

“I wouldn't move around so much if were you...not that you'd find yourself moving much any soon.”

“What's that...” Sonic hacked a bit, trying to get the bad taste of the liquid out of his mouth “...what's that supposed to mean?”

Kit stretched her arms a bit casually and smirked rather wide “Of course it's like you to gloss over details.”

Before Sonic had a time to really retort that statement, he clutched his stomach as it started to gurgle. He keeled over and dropped to his knees, groaning at the sudden shock.

“Ugh...it's feel like....”he stopped to let out a burp.

Kit couldn't help but to laugh at that.

Sonic blinked when he saw a bubble had came from his mouth after the burp. “Wha...,” he looked down and stared in shock as his entire body started to slowly fill up. “Am I blowing up...?”

He poked at his tummy, which had started to grow and heard a faint sloshing sound. It wasn't fat...it was...

“...water?!” 

At that, his body started to fill up faster, the button on his pants instantly flew off as his gut filled up faster and faster, and his shoes and gloves began to tear off.

His first instinct was to make a dash for the other vial, a presumed 'antidote'. But his legs failed him and he fell down belly-first on the ground with a big 'slosh'. The large amount of water inside him rippled and his body felt immensely heavy...too heavy to really lift his legs or arms very much.

It felt a lot different from being simply fattened, and the complete opposite of being inflated with air: he wasn't light on his feet but instead heavier. It was only a few yards ahead of him, but the bloating hedgehog could barely move himself mere inches. He struggled to lift himself up off the ground, as his body started to lose detail and change shape into something akin to a water balloon. His wide arms and thick fingers made it very hard to push himself off the ground, and his legs started to lose footing with the ground as his increasingly balloon-like torso started to interfere.

“Mmrff...Kit...” he struggled to speak from trying to simply move, as his neck started to recede into his growing water-filled mid-section.

Kit casually ignored the cry for help, sans a simple flick of an ear in mere acknowledgement of even hearing such a feeble attempt. Her long tail flicked casually and she looked rather intent in watching Sonic fill up further. She made no motion to the other vial beside her feet. This was becoming quite a pleasure for her, a large grin formed which only grew as Sonic did.

Sonic made one final, feeble attempt by reaching his huge, thickened arms to the vial, but he was still several feet away. With a large groan he lowered his arms as he ran out of energy to even move. His body was now severely inflated and he looked extremely taxed. His feet lost contact with the ground and were helplessly dangling behind him. He felt an immense sense of pressure and weight, his body was nearly impossible to even wiggle.

He went to try and speak but could only muster up a mere groan, a frown forming around his rounded, water-filled mouth.

Kit chuckled and get to her feet, her long tail easily grabbing the vial on the ground. She walked up to Sonic's overfilled self and stopped a few inches from his face.

Sonic was too exhausted to even react to her finally getting up with the vial.

“Well...I think the test was a success!” Kit reached for Sonic's round, water-filled cheek and softly rubbed it.

Without another word she moved her tail to Sonic's mouth and poured the other vial's content in his mouth.