The Rabbit’s Den and the Carrot’s Curse

The text message had arrived at six in the morning, vibrating Izuku’s phone right off his nightstand. It was short, aggressive, and written in all caps: *GYM FLOODED. PIPE BURST. DON’T GO THERE. COME TO MY PLACE INSTEAD. DON’T BE A LIMP NOODLE. BE READY TO SWEAT.*

Attached was a GPS pin for a high-end apartment complex in a district Izuku usually only saw on the news.

Standing in front of the sleek, reinforced steel door of Unit 702, Izuku felt like his heart was trying to vibrate out of his ribcage. He looked down at his gym bag, then at his reflection in the polished metal of the doorframe. He looked tiny. He looked like a delivery boy. He certainly didn't look like a student of the fiercest woman in the Hero Billboard Chart.

He pressed the buzzer.

"Enter!" a muffled voice barked from inside.

The electronic lock clicked open. Izuku stepped in, expecting a minimalist, high-tech sanctuary. Instead, he was greeted by the scent of expensive protein powder, laundry detergent, and something spicy—like cinnamon and peppers. The living room was sparse, dominated by a massive, custom-made leather sofa and a floor-to-ceiling window that overlooked the city. There were carrots on the coffee table. Not in a bowl, just... scattered.

"In the back, kid! Follow the sound of the thumping!"

Izuku walked down the hallway, his sneakers squeaking on the hardwood. He turned the corner into what should have been a second bedroom, but was instead a converted home dojo. The floor was covered in professional-grade tatami mats, and the walls were lined with mirrors.

His breath hitched.

Rumi was there, but she wasn't in her hero costume. She was wearing a sports bra that looked like it was struggling to contain her muscular torso and a pair of black spandex shorts that were so tight they looked painted on. Because she was at home, she had foregone her boots; her feet were bare, showing off the powerful, slightly elongated structure of her rabbit-like soles.

She was currently in a handstand, balancing on one hand while her legs were split in a perfect, vertical line.

"You’re four minutes early," she grunted, her face flushed from the blood flow. "Good. Early is on time. On time is late."

Izuku couldn't speak. His eyes were glued to the sheer amount of muscle on display. Without the white leotard covering her midriff and thighs, he could see the incredible complexity of her physique. Her hamstrings were corded like steel cables, and the way her glutes were framed by the thin spandex was... it was a lot for a twelve-year-old to process.

Rumi shifted her weight, dropping down from the handstand with the silence of a predator. She landed on her feet and immediately began a deep side-lunge, stretching out those massive legs.

"What's the matter? Cat got your tongue? Or are you just staring at the goods again?" She looked over her shoulder, a predatory glint in her red eyes.

"I-I-I... the anatomy!" Izuku blurted out, his face turning a shade of crimson that seemed physically impossible. "The way your vastus lateralis connects to the patella while you’re under tension—it’s just—I've never seen such high-density muscle fibers in a female build before!"

Rumi stood up, wiped some sweat from her forehead, and walked toward him. She didn't stop until she was inches away, forcing him to look up. "Kid, you're the only person I know who can make a compliment sound like a biology textbook. Just say it. You think I’m hot. It’s okay. I’m a national treasure."

She turned around, picking up an open soda can from a small side table. To Izuku’s absolute horror and fascination, she didn't drink it. She performed a deep squat, and as she stood back up halfway, she placed the can on the flat shelf formed by her glutes. She stood perfectly still, balancing the can there without using her hands.

"Check it out," she grinned, looking at him through the mirror. "Built-in cup holder. Can your classmates do that?"

Izuku’s jaw hit the floor. He tried to look away, but his eyes were trapped by the sheer absurdity and the physical prowess of the feat. "I... I don't think that's... that's not a standard hero technique, Mirko-san!"

"It's called 'functional mass,' Izuku! If you can't balance a drink on your ass, you aren't training hard enough!" She laughed, a loud, barking sound that filled the room. She twitched her hips, catching the can as it fell with a lightning-fast hand. "Now, quit gawking at my 'functional mass' and get changed. We’re doing high-intensity intervals. Since we’re in my house, the rules are different."

"Different how?" Izuku asked, his voice cracking.

"If you mess up a set, you have to do the next one while I’m sitting on your back," she said with a wicked grin. "And I’ve been eating a lot of protein lately. I’m heavy."

The training was, predictably, a nightmare. Without the distractions of a public gym, Rumi was focused entirely on him. They spent two hours on "The Rabbit Hop"—a series of explosive plyometric jumps designed to build the kind of twitch-fiber strength Izuku needed to compensate for his lack of a Quirk.

"Higher! You’re jumping like a frog, not a rabbit! Rabbits don't just go up, they go *through*!" Rumi yelled, pacing behind him.

Izuku was gasping, his legs feeling like they were filled with molten lead. Every time he slowed down, he could feel Rumi’s presence right behind him. At one point, during a series of deep lunges, he found himself staring at her legs again as she demonstrated the proper form. She was so close he could feel the heat radiating off her skin.

"Staring again," she sang out, dropping into an even deeper stretch that made the black spandex stretch to its absolute limit. "You know, if you keep this up, I’m gonna start charging you admission. Or maybe I’ll tell your mom you’ve got a crush on a pro hero twice your age."

"It's not a crush!" Izuku squeaked, nearly falling over. "I’m just... I’m analyzing the tension! You said I need to understand how the muscles fire!"

Rumi straightened up and walked over, leaning her weight against him. She was much heavier than she looked, her solid muscle pressing into his shoulder. "Sure, kid. Whatever helps you sleep at night. But seriously, look at this."

She flexed her right thigh. The muscle didn't just bulge; it rippled, appearing almost like armor plating under her tan skin. "This is what happens when you stop whining and start kicking. You want this? You want people to look at you and feel a chill down their spine?"

Izuku looked at the muscle, then up at her face. Her expression was uncharacteristically serious.

"I want to be able to stand my ground," Izuku said, his voice small but firm. "I want to be able to look at someone and not feel like I’m about to break."

Rumi’s ears flicked. She reached out and gave his ear a playful, painful tug. "Then stop looking at my legs and start using yours. Fifty more jumps. Go!"

By the time they finished, Izuku was a puddle on the floor. He was sprawled out on the tatami, his lungs burning. Rumi, meanwhile, looked like she had just finished a light jog. She disappeared for a moment and came back with two cold bottles of water and a bag of dried mango.

"Move over, shrimp," she said, plopping down on the mat next to him. She sat with her legs spread out, leaning back on her elbows.

Izuku sat up slowly, taking the water. "Thank you for letting me train here. I know it’s... it’s your private space."

"Eh, it’s just a box with a view," Rumi shrugged. "Besides, it’s fun watching you struggle. It reminds me of when I was a sprout. Everyone thought I was just some fluke with long ears. They didn't see the hours I spent kicking trees until my shins bled."

They sat in silence for a while, watching the sun begin to dip toward the horizon through the large window. The orange light caught the white of Rumi’s hair, making it glow.

"Mirko-san?" Izuku asked quietly.

"Rumi. I told you, when we're in the den, use my name."

"Rumi-san... do you ever get lonely? Being a solo hero? Everyone else has sidekicks and agencies."

Rumi popped a piece of mango into her mouth, chewing thoughtfully. Her ears twitched as she listened to the city noise far below. "Sometimes. But most people just slow me down. They worry about 'collateral damage' or 'public relations.' I just want to fight. I want to feel the impact. If I had a team, I’d be constantly looking over my shoulder to make sure they haven't tripped over their own capes."

She looked at him, her red eyes softening just a fraction. "But you... you’re not a sidekick. You’re more like... a very annoying, very green apprentice. You don't slow me down because you're too busy trying to keep up."

Izuku felt a surge of warmth in his chest that had nothing to do with the workout. "I'll keep up. I promise. I’ll work harder than anyone."

"I know you will," she said, standing up and stretching. As she did, her shirt rode up, revealing the sharp lines of her abs and the metal plate of her navel piercing.

Izuku immediately looked at the floor, his face heating up again.

"Oh, for the love of—get over here," Rumi laughed. She grabbed him by the back of his shirt and dragged him toward the kitchen. "You’ve been staring at me like I’m a forbidden snack all day. If you’re that hungry, I’ll make you some actual food. But fair warning: I only know how to cook two things, and one of them is just a pile of eggs."

"I like eggs," Izuku said, stumbling after her.

The kitchen was as chaotic as the rest of the apartment. Rumi moved with a frantic, high-energy efficiency, cracking eggs with one hand and tossing vegetables into a pan with the other.

"So," she said, leaning against the counter while the eggs sizzled. She gave him a sidelong glance, her tail twitching. "What’s the word at school? People still giving you grief?"

Izuku’s smile dimmed slightly. "A little. Kacchan—I mean, Bakugo—is still... himself. He thinks it’s funny that I’m still trying. He calls it 'delusional.'"

Rumi’s expression darkened. "Bakugo, huh? The kid with the explosions? I’ve seen some of his middle school tournament footage. He’s got talent, but he’s got the personality of a clogged toilet. Next time he says something, you tell him that the Number Five Hero thinks he’s a loud-mouthed amateur."

"I don't think that would make things better," Izuku chuckled nervously. "He’d probably just explode my desk."

"Then explode his ego," Rumi snapped, turning back to the stove. "You’re training with me now. You’re learning to move like a predator. He’s just a kid with flashy hands. You’re building a foundation that’ll last a lifetime."

She plated the food—a massive mountain of scrambled eggs and spinach—and set it in front of him. "Eat. You need the fuel."

As they ate, the atmosphere shifted from mentor-and-student to something more relaxed. Rumi told him stories about her early days in the pro world—about the time she accidentally kicked a villain through three office buildings and had to spend a month’s salary on the repairs, and about the rivalries she had with other top heroes.

"Endeavor is a total stiff," she said, gesturing with a fork. "He looks at me like I’m a stain on the carpet. And Hawks? That bird-brain talks too much. He’s always trying to get me to go out for drinks. I told him I don't hang out with people who have feathers."

Izuku listened with wide eyes, his "hero nerd" side coming out in full force. He started muttering under his breath, analyzing the social dynamics of the Top Ten, his hand moving in a phantom writing motion.

"There he goes again," Rumi sighed, but she was smiling. "The muttering. It’s creepy, kid. Really creepy."

"S-Sorry! I just... it’s fascinating! The way the Hero Public Safety Commission manages solo heroes versus agencies—"

"Eat your eggs, nerd."

When dinner was finished and the sun had fully set, Izuku began to pack his things. He felt a strange reluctance to leave. The apartment, despite its chaos and the smell of carrots, felt safe. It was a place where he wasn't "Deku." He was just Izuku, the kid who was going to be a hero.

Rumi walked him to the door. She looked tired for the first time that day, her ears drooping slightly.

"Hey, Rumi-san?" Izuku said, pausing at the threshold.

"Yeah?"

"Thanks for... for the cup holder trick. And the eggs. And for not being disappointed that it was just me today."

Rumi leaned against the doorframe, her arms crossed over her chest. The black spandex shorts were still doing a lot of work, and Izuku managed to keep his eyes strictly on her face.

"I'm never disappointed in someone who shows up," she said, her voice unusually soft. "You showed up. That’s more than most people ever do."

She reached out and patted his cheek. Her hand was calloused and strong, but the gesture was incredibly gentle. "Get home safe. And practice those pivots in your room. If I see you wobbling on Thursday, I’m sitting on you for the whole session. I mean it."

"I'll practice! I promise!" Izuku said, bowing deeply.

As he turned to walk toward the elevator, he felt a sudden burst of courage. He turned back and waved. "And for the record... I think the cup holder thing was really impressive!"

Rumi’s bark of laughter followed him all the way into the elevator.

"He’s definitely got good taste!" she shouted down the hallway as the doors closed.

Izuku leaned against the back of the elevator, his face buried in his hands. He was mortified, exhausted, and his legs felt like jelly. But as he looked at his reflection in the mirrored walls, he didn't see the scrawny, crying kid from the beach. He saw a boy who had just survived a day in the Rabbit’s Den.

He stood up a little straighter, adjusted his backpack, and began to mimic the footwork Rumi had shown him, his red shoes dancing on the elevator floor. He had a long way to go, but for the first time in his life, he wasn't running away. He was chasing someone. And she was waiting for him to catch up.