It was supposed to be a relaxing day.
Mirio had finally convinced Lily to try something "normal" for couples: a trip to the local public pool. It was summer, the sun was blazing, and the community water center was open to all species—humans, beastkin, slime girls, and everyone in between. No drama. No surprises. Just cool water, ice cream, and maybe a nap under an umbrella.
That was the plan.
And like most plans involving Lily… it didn't survive the first hour.
"Ta-daaa!" Lily declared as she emerged from the locker room.
Mirio nearly dropped his water bottle.
She stood in front of him, wobbling proudly in a neon-pink one-piece swimsuit. At least, it used to be a one-piece. Her slime body had molded around the outfit like memory foam, stretching it far past its intended limits. Her breasts had swollen slightly just from the moisture in the air, and now bulged against the thin fabric in jiggling domes of translucent squish. Her hips pulsed visibly, the suit digging into the sides like it was clinging on for dear life.
And the tentacle strands that made up her "hair" had somehow looped into the straps, tugging them tighter with every bounce.
Mirio blinked. "Lily… that swimsuit is way too small."
She grinned. "It stretches!"
"It's not supposed to stretch that much…"
"Hubby~" she sang sweetly, grabbing his arm. "Let's swim!"
He sighed and gave up. "Just… try not to melt in the water."
She winked and skipped toward the pool deck with a plop plop of her feet.
---
At first, everything went surprisingly well.
Lily slid into the shallow end with a delighted squeal. Her glow pulsed brighter, and she rolled lazily along the surface like a living pool toy. Other swimmers gave her curious glances—especially when her chest inflated slightly from soaking up the poolwater—but she waved happily at them.
Mirio sat on a nearby lounge chair, watching her float. For once, things felt kind of… normal.
Then she dipped under the surface.
And stayed under.
For a little too long.
He stood up. "Lily?"
The water rippled.
Then burst.
A wave exploded out of the deep end as Lily erupted upward, gasping.
But she wasn't the same.
Her body had expanded.
Her thighs wobbled visibly as she climbed onto the pool ladder, her hips three times their usual size, her chest now a pair of bouncing, translucent water balloons that sloshed with every movement. Her swimsuit, clearly never meant for this volume, had stretched to translucent levels, clinging like a second skin that was losing its grip.
Mirio ran to her. "What happened?!"
She pouted. "Pool feels… weird."
Then her body shivered.
Her core pulsed.
And with a soft fwomp, her breasts inflated again—stretching the straps until they snapped like rubber bands.
SNAP!
The top half of her suit shot backward into the water like a torpedo.
Lily blinked. "Oops."
Mirio turned bright red. "You're—You're naked!"
She looked down.
Her massive boobs jiggled freely in the open air, still shimmering with chlorinated water. The nipples were faint glows inside her transparent gel, swaying gently with her every breath.
Several pool-goers gasped. A few clapped. One dad fainted into the water.
Lily tilted her head. "But I'm see-through. Isn't that like… wearing nothing all the time?"
"That's not the point!!"
Suddenly her legs began to soften. The chlorine was messing with her consistency, thinning her core mass. She started to melt—literally—her body sloshing downward into a thick puddle that still somehow maintained a pair of huge, floating boobs wobbling on top.
"Hubbyyy~ I'm drippyyy~"
"Out of the pool!" he shouted, wrapping her in a towel as fast as he could.
She giggled as her chest bounced against his arms. "The water makes me bigger. I like this pool!"
"It's eating your clothes, Lily!"
She pouted. "Just the top."
"And half your bottom!"
He managed to bundle her up and guide her toward the changing area, but her body was still unstable. Every step, she squelched a little wider. Her butt, no longer contained by fabric, swelled behind the towel like a water balloon. Her thighs rubbed together with a sticky slap.
"I think the chlorine's destabilizing you!"
She tilted her head, boobs bouncing. "Is that why I feel tingly?"
"Yes! And bigger! And bouncier!"
She perked up. "You noticed?"
He groaned. "Lily, we are never going swimming in a chlorinated pool again."
She slid her arms around his waist from under the towel, pressing her giant, wet chest into his stomach. "Even if I call you my wet and sexy good boy~?"
His eye twitched.
"Into the shower. Now. We need to rinse the chemicals off you before you end up filling a water bed with your butt."
"But I am the water bed."
He dragged her into the shower stalls, where she promptly reformed into her standard shape—though her breasts remained one size too big and jiggled with vengeance.
As the cold water hit her, she sighed.
"Can we come back tomorrow?"
He facepalmed. "Only if they install a slime-proof swimsuit rack."
She leaned in and whispered, "Or we could just skip the swimsuits next time~"
The slap of her boobs on his arm nearly knocked him into the wall.
And just like that, the pool trip was over.
Lily never did get another swimsuit. But she did get banned from the pool for "wardrobe disruption."
Mirio decided next time, they'd just buy a kiddie pool.