Dragon's Heart, Hero's Will

Chapter 3: The USJ Attack

It’s early afternoon when Class 1-A gathers at the Unforeseen Simulation Joint (USJ) for their special lesson in Foundational Skill of Heroics. Kirishima stands among his classmates, heart pounding as he listens to Thirteen's speech. The idea of using their quirks for rescue operations excites him, but the anxiety of losing control is always there, just beneath the surface. I have to keep it together.

Everything changes in an instant. A dark portal opens, and the League of Villains spill out into the arena. This isn’t a drill. Kirishima tenses as he watches Kurogiri and the rest of the villains materialize. His dragon quirk stirs within him, sensing danger, but he forces it down. I have to stay in control.

Beside him, Bakugou leaps into action, explosions sparking from his hands. Kirishima follows him without hesitation, instinctively drawn to Bakugou’s presence. Together, they charge at Kurogiri, but their attacks pass through him harmlessly. Frustration flares in Bakugou’s eyes as he prepares another blast.

Before they can regroup, Kurogiri’s mist surges forward, and Kirishima feels himself being pulled away. He lands hard in the Ruins Zone, with Bakugou by his side. But they’re not alone. Villains surround them, weapons drawn.

Bakugou is already on the attack, blasting the villains away with ease. Kirishima watches him for a moment, both impressed and unsettled. Bakugou’s raw power, his unrelenting aggression—it stirs something in Kirishima’s dragon instincts, something primal, something he can’t quite control.

But then, it happens.

A villain lunges at Bakugou from behind, a blade gleaming in his hand. Kirishima’s heart skips a beat, and his vision blurs. His dragon, the beast within him, surges forward, demanding to protect Bakugou. My omega.

Bakugou has already taken the villain out but before Kirishima can stop it, his body begins to transform. Scales ripple across his skin, wings burst from his back, and his muscles bulge as his form expands. His mind is overtaken by the dragon’s primal instincts—rage, protection, and the need to eliminate the threat.

With a deafening roar, Kirishima lunges at the remaining villains. His massive claws tear through the air, shredding the villains in half and sending them crashing into the rubble. But Kirishima doesn’t stop. His dragon instincts have fully taken over, and he turns his gaze to the rest of the villains.

They’re a threat to my omega. They must be eliminated.

Kirishima rampages through the Ruins Zone, his wings beating furiously as he takes down one villain after another. His fire breath ignites the debris around him, sending plumes of smoke billowing into the air. Every strike is brutal, every roar a declaration of his uncontrollable fury.

In the distance, Bakugou watches in stunned silence. His mouth is set in a hard line, eyes wide as he takes in the terrifying sight of Kirishima’s dragon form tearing through their enemies. “What the hell?” he mutters, his voice a mix of confusion and disbelief. This wasn’t the Kirishima he knew. This was something else, something wild and dangerous.

The rest of Class 1-A stares in horror at the monitors. Midoriya’s voice is barely a whisper. “That’s Kirishima?”

Uraraka’s eyes are wide with fear. “I didn’t know his quirk was like that…”

Yaoyorozu, ever the one to try and stay calm, swallows hard. “It’s… it’s more than just a quirk. He’s completely transformed.”

“Kirishima…” Mina mutters, worry etched across her face. “He’s out of control.”

The fear in their voices is palpable. They’ve never seen Kirishima like this—so wild, so violent.

Back in the Ruins Zone, Kirishima’s rampage shows no sign of stopping. He crushes every villain in his path, sending rubble and bodies flying with each strike. His roars shake the ground, his fire breath scorching the walls around him. He’s lost in the haze of his dragon instincts, driven only by the need to protect, to destroy anything that threatens Bakugou.

And then he turns to Bakugou.

In an instant, Kirishima surges forward, his massive claws wrapping around Bakugou and pulling him close. His dragon mind screams to keep Bakugou safe, to protect his omega. His wings beat the air, lifting them both off the ground as he cradles Bakugou against his chest.

“What the hell?!” Bakugou shouts, struggling against Kirishima’s hold. “Let me go, you idiot!”

But Kirishima doesn’t let go. His claws tighten around Bakugou, his alpha instincts demanding that he keep him close, keep him safe. His breath is hot against Bakugou’s skin, his heart pounding in his chest. Mine.

Bakugou grits his teeth, his body tense with frustration. “I don’t need your damn protection!” he yells, his explosions flaring as he tries to break free. “Let me go!”

But Kirishima doesn’t respond. His mind is too far gone, too consumed by the dragon’s instincts. He can’t hear Bakugou’s protests. All he knows is that Bakugou is his omega, and he has to protect him.

Bakugou’s fury ignites. “Kirishima! Snap out of it!” He slams his fists against Kirishima’s chest, detonating explosion after explosion, but it’s no use. Kirishima’s dragon form is too strong, too overwhelming.

“Kirishima, damn it!” Bakugou’s voice is raw, desperate. He’s not just angry anymore—there’s something deeper, something that shakes Bakugou to his core. Fear. Fear that Kirishima will lose himself completely, fear that the friend he knows will be gone forever.

“Eijiro!” Bakugou’s voice cracks as he shouts his friend’s first name. “Come back, damn it!”

For a moment, Kirishima’s glowing eyes flicker. The human part of him—the part buried deep beneath the dragon’s rage—struggles to surface. His claws loosen slightly, his wings faltering in the air.

“Eijiro… it’s me,” Bakugou says, his voice softer now, the explosions dying down. “You’re scaring me, you idiot.” later he'd lie that he'd been soft!

The sound of Bakugou’s voice—the softness, the vulnerability in it, which Bakugou later denies,—cuts through the fog in Kirishima’s mind. The dragon roars in protest, but Kirishima fights it, claws retracting as his human consciousness claws its way back to the surface.

Slowly, painfully, Kirishima’s form begins to shrink. His wings retract, his muscles slim down, and his scales fade away, leaving his human skin behind. His chest heaves with exertion, and his eyes, no longer glowing, meet Bakugou’s.

“I-I’m sorry,” Kirishima mutters, his voice shaky and hoarse.

Bakugou glares at him, but there’s something else in his eyes—something like relief. “You better be, shitty hair. Next time, don’t you dare pull that crap again.”

Kirishima drops to his knees, his body trembling from the aftershocks of his transformation. His dragon instincts are still there, lurking beneath the surface, but for now, he’s back in control. Barely.

He looks up at Bakugou, the weight of his actions pressing down on him. I almost lost myself again. And worse—he almost hurt the one person he’s sworn to protect.

“I’ll never let it happen again,” Kirishima vows softly, his voice thick with regret. But deep down, he knows that his dragon quirk is a part of him. A part he can’t fully control.

And as Bakugou stands over him, fists clenched and jaw tight, Kirishima knows that the battle between his human side and his dragon will never truly end.