Izuku couldn’t stop staring out the car window, her big eyes wide like a kid in a candy store. The world blurred by—trees whipping past, lights from distant houses flickering like stars fallen to earth, the road humming under them. She’d never felt anything like it, this metal box on wheels carrying them along. “Katsuki, what… what is this thing?” she asked, voice all breathy and excited, pressing her nose to the glass. Her fingers traced the window, leaving little smudges.

He glanced over, smirking a bit, one hand on the wheel, the other resting on the gear shift. Rain still pattered lightly on the roof, but the storm was easing. “It’s a car, Izuku. Humans use them to get around. Faster than swimming, huh?”

She giggled, that bubbly sound filling the space, making his chest warm. “It’s so fast! And look—those tall things, with leaves! Are those trees? And the sky… it’s so big up here, not muffled by water.” She twisted in her seat, the coat slipping a little on her shoulders, revealing a glimpse of her creamy skin. “Everything smells different. Salty, but… earthy? And wet grass? Oh, Katsuki, tell me everything!”

He chuckled, low and rough, eyes flicking back to the road. “Yeah, trees. And that’s the moon peeking through the clouds—full tonight, that’s why the storm hit hard.” He didn’t mention how her excitement was stirring something in him, how her bare legs shifted under the coat, making him hyper-aware of her naked body beneath. “But listen, we can’t go straight home yet. My place… it’s big, but I got people there. Can’t just show up with you in nothing but my coat. My wife—she’d flip.”

Izuku tilted her head, still buzzing. “Wife? What’s that?”

He cleared his throat, gripping the wheel tighter. “Uh, like a mate. Partner. But we’ll talk about that later. First, clothes. Real ones.”

She nodded, not fully getting it, but trusting him. They pulled into a quiet strip mall, one of those late-night boutiques that catered to the rich crowd—designer stuff, softly lit. He parked close, killed the engine. “Here. Stay put a sec.” He hopped out, came around to her side, and buttoned up the coat on her—big fingers fumbling a bit on the buttons, brushing her soft tits accidentally through the fabric. She gasped softly, but didn’t pull away. The coat hung to her knees, like an oversized dress, hiding most of her curves but not the way her ass swayed.

“Alright, let’s go.” He offered his arm, and she clung to it, wobbling on her new legs. “One foot in front of the other, like swimming but on land.”

She laughed, stumbling a little into him. “It’s hard! My tail was easier. But… I like holding onto you.” Her voice dropped shy, eyes peeking up at him through lashes.

Inside, the shop was warm, scented with lavender and new fabric. Soft music played, racks of clothes everywhere—silks, cottons, laces. A saleswoman perked up, eyeing them curiously but professionally. “Evening, sir. How can I help?”

Katsuki nodded. “Need some outfits for her. Basics, dresses, whatever. She’s… new to this.” He shot Izuku a look. “You pick what you want, okay? I’ll wait here.”

Izuku’s eyes lit up, nodding fast. “Okay! Everything’s so pretty…” The staff lady—Maria, her tag said—smiled and led her away. “Come on, hon. Let’s find your size. You’re gorgeous, by the way—those curves? We’ll make ’em pop.”

Izuku followed, touching fabrics tentatively, like they might bite. “These… go on the body? All over?” She frowned at a long gown. “Too much. I like less. Feels… free.” She gravitated to the skimpiest stuff—tiny crop tops that barely covered her massive boobs, shorts so short they’d ride up her fat ass, lacy bralettes and thongs in the lingerie section.

Maria raised a brow but helped. “These are underwear, sweetie. Bras for up top—support those girls of yours. Thongs for down below, under the clothes. Keeps everything… tidy.”

Izuku blinked, holding up a pink thong, stretching it. “Under? Humans are so weird. Why cover twice?” But she shrugged, adding a pile: sheer bras that would let her nipples peek through, thongs that were basically strings, tiny tank tops, micro skirts. “These feel better. Less… heavy.”

Maria chuckled. “Alright, wild child. Try this dress on—it’s short, but cute.” Izuku slipped into the changing room, emerging in a little black number—tight, hugging her tits so they spilled over the low neckline, hem barely skimming her thighs. She twirled for Katsuki, who was sitting on a bench, scrolling his phone but snapping his head up.

“Fuck,” he muttered under his breath, stunned. She looked like sin—boobs bouncing with the spin, ass peeking as the dress rode up, and yeah, he caught a flash of that tiny thong nestled between her cheeks, pink fabric against her fat pussy lips. His cock stirred hard, tenting his pants a bit. “You… you look amazing, Izuku.”

She beamed, twirling again. “Really? It feels nice—light! See?” Another spin, and he had to shift, hiding his growing hard-on.

“Yeah, uh… perfect.” He stood, face flushing as she handed him the pile she’d chosen—all tiny, all slutty. Bras with lace that hid nothing, thongs in every color, shorts that were glorified panties. “These… all of ’em?”

She nodded, innocent as hell. “Yes! The big ones feel wrong. Like chains.”

He swallowed, blushing deeper at the thongs—imagining them on her plump ass. “Alright. Whatever makes you comfy.” He paid—didn’t even blink at the total, swiping his card while Maria bagged it all.

Back in the car, bags in the back, he started driving home for real. Izuku fiddled with her new dress, tugging the hem. “Thank you, Katsuki. You’re so kind. Tell me more about your world?”

He smiled, but it faded a bit. “Listen, Izuku… I got a wife. Sakura. And a son—little baby, Kenzo. He’s five months, chubby as hell, my everything.” He glanced at her, seeing her pout—those full lips pushing out, jealous cute.

“A wife…” she murmured, looking down. “So you’re… taken? Like mated forever?”

He sighed. “Kinda. But it’s not… happy. Arranged thing. Anyway, excited about the baby?”

Her eyes sparkled again. “Yes! A human baby? I’ve never seen one. Are they soft? Tiny like fish babies?”

He laughed. “Softer. Squishy cheeks, little hands. You’ll love him.” Then his voice got serious. “But Izuku—don’t tell anyone you’re a mermaid. Humans… some are bad. They’d hurt you, or take you away. Experiments, cages. Promise?”

She nodded fast, eyes wide with fear, poor thing trembling a little. “I promise. Scary… I won’t say.”

“Good girl.” He reached over, patting her thigh—hand lingering a second too long on that smooth skin. “I’ll tell my wife you’re the new nanny. Means you look after the baby—feed him, play, keep him safe. Okay? You can stay in the guest room near his.”

She bounced in her seat, tits jiggling. “Yes! I love babies. I’ll be the best nanny. Cuddle him all day?”

He grinned. “Yeah, something like that.”

They pulled up to the mansion—gates swinging open, driveway lit with soft lights, the place sprawling like a palace. Glass walls glowing, gardens lush even in the dark, pool shimmering blue. Izuku gasped, leaning forward. “Katsuki… this is your home? It’s huge! Like a coral castle, but on land. And the lights—everywhere!”

He parked in the garage, chuckling. “Welcome. Come on.” He grabbed the bags, helped her out—her legs steadier now, but she still held his arm. Inside, the foyer was grand—marble floors, high ceilings. Sakura was in the living room, lounging on the couch in a silk robe, phone to her ear, laughing at something. She looked up, eyes narrowing at Izuku—scanning her tiny dress, the way it hugged her fat ass and big boobs.

“Hold on,” Sakura said into the phone, then to Katsuki: “Who’s this?”

He set the bags down. “New nanny. Izuku. Picked her up on the way home—agency sent her last minute. Figured we needed help with Kenzo.”

Sakura rolled her eyes, judging hard—lips curling. “Fine. Whatever.” She waved dismissively, back to her call. But as she walked off, heels clicking, she muttered under her breath, “Slutty little thing. Those tits—fake? Whatever, as long as she doesn’t touch my stuff.”

Izuku blinked, confused, but Katsuki squeezed her hand. “Ignore her. Come on, your room.” He led her upstairs, to a cozy guest suite—big bed, soft sheets, window overlooking the sea. Right next to the nursery. “This is yours. Bags here—change if you want.”

She nodded, peeking around. “It’s pretty. Smells like flowers.”

Then he tugged her gently. “Now, meet the star.” The nursery was soft-lit, walls painted with stars, crib in the center. Kenzo was awake, giggling in his onesie, kicking chubby legs, tiny fists waving.

“Oh!” Izuku gasped, hand to her mouth. “He’s… so adorable. Look at those cheeks! Like little puffs.”

Katsuki scooped him up, bouncing him gently. “Hey, buddy. Meet Izuku.” Kenzo cooed, eyes locking on her—big and curious, just like his dad’s. Then he reached out, tiny hands grabbing air toward her.

“Aww, he wants you,” Katsuki said, voice soft. “Here—support his head.” He carefully passed the baby over.

Izuku took him, cradling close, her massive tits a perfect pillow. “Hi, little one. I’m Izuku. You’re so squishy!” Kenzo nuzzled right in, face burrowing into her cleavage, little mouth rooting around like he was hungry. She giggled, making baby talk. “Oh, you like that? Soft, huh? Coo-coo, tiny human. Look at your toes—wiggle wiggle!”

Katsuki watched, heart melting—and cock stirring again at the sight. Her in that tiny dress, baby nuzzling her fat tits, innocent but so fucking hot. “You’re a natural,” he murmured, stepping closer. “He loves you already.”

She beamed up at him, rocking Kenzo. “I love him too. Thank you, Katsuki. For everything.” Her eyes shone, and for a moment, the air thickened—his hand brushing her arm, lingering.

“Yeah,” he said, voice husky. “Anything for you, Izuku.”