(Part 1 can be found here: https://www.furaffinity.net/view/50504905/ )

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"Oh my gawwsh, I actuawwy made it! Phat wash...pwetty fun, actuawwy~"
The taut, blimp would breathe a sigh of relief upon miraculously finishing the stage without blasting into bits. he absolutely did not escape unscathed, however~

Elfilin's features had swelled and stuffed themselves into an even more cartoonish, borderline unrecognizable states. His limbs were useless spheres of fat that could only quiver in pleasure, being completely incapable of actual movement. His tail had also ceased any kind of movement, being little more than a massive balloon poking out of his butt~ His cheeks smushed together, with the blush upon them feeling more like strain from the pressure, his ears had founded out nearly completely, and his eyes puuushed further, getting bigger and bigger, with one now noticeably larger than the other~

As he sloowly used what little movement he had left to stomp, bounce, and roll his way back to Waddle Dee Town. Upon arriving however, the poor Waddle Dees began to run off in fright! Understandably, they thought this massive balloon WASN'T Elfilin, but rather a monster that had come to cause havoc!
"Oh nooh...showwy! I'm not uh monshtuh, pweashe!"
Also understandably, Elfilin's even deeper voice didn't help matter...either that or they just couldn't hear him over all the creaking~

However, it wasn't until a voice called out that made them realize who this blimp was.
"Puyo?"(Hm?)
It was Kirby! Having had a nice long rest, he was ready to continue his adventure through this strange new world! and despite humongous pressure, intense rubbery noises, and massively engorged, about to burst features? He knew this "monster" was just his friend!
"Puyo!"(Friend!)
"Ohh Kirby! Yooh make it wook sho eashy! Wheuh dooh youh put awwl that shtuff youh eat? I knowh ahm a bit shmoller...but thish wash awwl fwom ONE wevel!!"
"..."
If the puffball could, he would shrug.

"Well...nowh phat youh back uph, we shoouwd continuh fwom wheuh we weft awf...but...that phelt SHUPER gud!~"
"I wash wowwied I wouwd expwode at fiwst, but nowh? I think I get why youh wike doin it!~"
"Can I ah...~"
"Can I hewp youh wiff wevelsh mooh often?~"

"Puyo!!"(Yay!!)
"Yay!~"
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Was already considering doing a part 2, but I got a request that gave me an excuse to do so~ (Might eventually do a Part 3 as well, possibly featuring a few other folk as smaller ubers too~)

Also for the record, while I do like teasing about popping, and having it as a threat to toy with characters, I don't actually like having it happen. I much prefer "continuing to grow, yet FEELING like your going to pop even as you continue swelling~", if that makes sense.