It all started when Lily got too excited about making new friends.
It was a bright afternoon in the open training field just outside town. The grass was soft, the sky was clear, and a shy centaur girl named Meya stood trembling near the fence line, brushing her long brown hair over one shoulder. Her body was lean and toned, her equine half a warm chestnut color with a silky tail. Her eyes were wide, cheeks pink, and her posture stiff—especially with how nervously she glanced over at Mirio every few seconds.
Mirio stood nearby, arms crossed, watching Lily as she bounced in place, her tentacle-hair squishing with enthusiasm. "Lily," he warned, "are you sure this is a good idea?"
Lily gave him a huge smile and a thumbs-up—well, a thumbs-up shaped tentacle. "Hubby say help. Lily help!"
He groaned. "I said help her get used to being ridden. Not turn into a living saddle…"
But it was too late.
Lily had already climbed up behind Meya, who stood frozen with anxiety. "I-I've never carried someone before," she whispered.
Lily's slime rippled with excitement. With a small hop, she launched herself up onto Meya's back—her form instantly flattening and reshaping into a perfect saddle-like shape. Her body spread across the centaur's back, her main mass curving into a deep seat, sides extending into straps that wrapped gently around Meya's equine body.
Meya gasped, her tail twitching. "W-What is she doing?!"
"Just let her," Mirio sighed. "She's trying to help. Kind of."
Lily's body sealed smoothly in place, her upper half now molded into a high-backed seat. She gave a little squish of satisfaction and let out a proud "Bloop."
Meya stood still, her legs stiff. "It… feels kind of nice. Cold, but not sticky."
"She's temperature regulated," Mirio said. "Mostly."
Lily's tentacle-hair reshaped into elegant reins that floated forward and gently rested over Meya's shoulders.
"I-I guess I could try walking," the centaur whispered.
But then the sun came out from behind a cloud.
And the heat hit.
Lily's body responded instantly.
Her slime, which had been semi-solid to maintain the saddle shape, began to soften.
Meya took a cautious step.
Lily slid.
The saddle that had been perfectly molded to Meya's back now sagged slightly, the seat deepening and her side supports loosening.
"U-Um—!" Meya gasped.
Then Lily's body slipped lower.
Right between Meya's flanks.
Meya's cheeks turned scarlet. "I—I can't move!"
Her hind legs bent awkwardly as Lily's melting form squished down beneath her tail, the once-helpful saddle now pressing up against her inner thighs and back hips. Her body quivered from the strange sensation as Lily continued to soften—her slime wrapping unintentionally around Meya's waist, clinging to sensitive spots.
Mirio's eyes widened. "LILY!"
She squeaked in surprise—her saddle form now fully slipping down Meya's back like melting pudding.
Meya yelped as her legs buckled. "It's—It's hugging me!"
Lily, realizing her mistake, quickly tried to re-solidify, but the heat had already weakened her stability. Instead of becoming a saddle again, she reshaped into her usual humanoid form—but still wrapped around Meya's lower half, arms snugly coiled around the centaur's hips and her chest squished embarrassingly against Meya's tailbone.
"I'M STUCK!" Meya shrieked, tail frantically swishing as she pranced in circles.
Lily's body jiggled wildly with each step, her breasts bouncing against the back of the poor centaur girl as she tried to cling without sliding off.
Mirio ran over, trying not to laugh. "Lily, disengage! She's not ready for full contact slime riding!"
Lily moaned apologetically and slowly peeled herself off, slurping wetly off of Meya's back like a thick, sticky blanket. Meya collapsed onto the grass, breathing hard, face burning red.
"I-I feel like I just got spooned by a bathtub…"
Lily shrank guiltily, her body now cool and damp from sun exposure. She patted Meya's hoof and bubbled out a quiet, "Sorry…"
Mirio offered a towel. "Next time, maybe stick to a dry saddle."
Lily wrapped the towel around herself and whispered up at him.
"Hubby... Lily tried."
He patted her gooey head. "You did. Maybe just… less wrapping next time."
Meya coughed softly. "C-Can I still have a hug, though? Just the upper half?"
Lily brightened instantly.
And five seconds later, Meya was pinned under a giggling slime girl's chest, tail twitching as she squeaked from embarrassment all over again.