[Third Person's PoV]
With a burst of speed, All Might dashed toward All For One, delivering a powerful punch that caused the air to swirl around his fist from the sheer force of his strike.
All For One raised his arm, catching All Might's punch in his massive hand. The impact created a powerful gust of wind, but AFO, with one of his many quirks, absorbed the shockwave into his body. His arm swelled grotesquely before transferring the energy to his other arm. With a sinister grin, he retaliated, throwing a punch back at All Might with double the strength.
All Might barely managed to cross his arms in defense, but the force of the blow still sent him crashing into a nearby building, leaving a crater in its walls.
Muscles bulging, All Might pushed off the rubble, rocketing toward AFO again. The ground beneath him shattered as he launched himself forward, eyes focused and full of determination. Gone was his usual smile, replaced with a look of grim resolve.
AFO stood firm, preparing for the next attack as his arm morphed once more into a monstrous blend of muscle and machine. But All Might was faster this time. With a booming yell, he delivered a punch straight to AFO's midsection. The impact was catastrophic, sending shockwaves through the area, causing nearby buildings to tremble and windows to shatter.
AFO grunted, absorbing the blow's force with another quirk, redirecting the energy into the ground beneath him to stabilize himself. Without hesitation, he swung his enlarged arm at All Might, the sheer force of his strike splitting the air. All Might narrowly dodged the attack, leaping into the air before coming down with an overhead punch.
AFO caught All Might's fist with both hands, and the ground buckled beneath them from the immense power. He chuckled darkly, "You've recovered, All Might, but your strength isn't what it used to be!"
Straining against AFO's grip, All Might growled, "I may have weakened, but the strength I have now… is enough!" With a mighty roar, he landed on the ground, crouching low and pulling his fist back. "TEXAS SMASH!"
AFO quickly conjured a shield using one of his quirks, but All Might's strength shattered the barrier, though it lessened the force of the blow. AFO slid back a few inches, visibly irritated.
Suddenly, AFO raised his arm, and a hole appeared in his palm. From it, a massive, spinning drill shot toward All Might. Before it could land, a device slid from All Might's leg, projecting a holographic shield that intercepted the attack. Both the shield and drill shattered, surprising them both.
"I gotta say, you might have a face only a mother could love!" came a voice from above. Tony Stark, clad in his nanite armor, blasted into the battlefield, zipping past All Might and slamming into AFO with repulsor energy.
AFO staggered back, momentarily caught off guard, but recovered swiftly. He grabbed Tony by the mask and slammed him into the ground with such force that the ground cracked. "This isn't a fight for a child to intervene in!" AFO growled.
Before Tony could respond with one of his usual quips, All Might appeared with a flying kick. "BRAZILIAN SMASH!" he roared, catching AFO by surprise and sending him crashing into a nearby building, which collapsed onto him.
All Might turned to Tony, concern in his voice. "Are you alright, young Stark?"
All Might heard a faint chewing sound before Tony, in the safety of his hotel room back in Europe, replied through the suit's speakers, "Huh? Oh yeah, I'm fine. But you do realize this is just my armor, right?"
"Ah… right." All Might nodded awkwardly. "But, do you really have to be eating right now?"
"Melissa's feeding me grapes… hard to say no to that," Tony said with a grin, "It's one of life's many pleasures… You should try it sometimes"
All Might was at a loss for words, so he turned his attention back to AFO, who emerged from the rubble, brushing dust off his suit. "You really think you two can stop me? Your combined efforts still aren't enough to challenge my power."
Tony's AI, Friday, was already working on new attack strategies. "Boss, he's absorbing kinetic energy and using it to enhance his strength beyond normal limits."
All Might cracked his neck, ready for another round. "Enough talk! Let's finish this!" He rushed forward, the ground shaking with each step, his muscles surging with every ounce of strength he could muster. He threw another powerful punch aimed at AFO's head.
AFO braced himself, but Tony's nanite armor darted in from the side, firing repulsor blasts at AFO's flank. "Ever heard of a two-on-one fight?" Tony quipped.
AFO groaned as the combined attack pushed him back. Using another quirk, he hardened his body like steel, absorbing most of the damage, but Tony's continued assault began to crack his defenses. "Persistent pests!" AFO growled, releasing a shockwave that knocked both All Might and Tony's suit back.
Tony quickly regained control mid-air, deploying drones to surround AFO. "Let's see how he handles this," Tony muttered as the drones opened fire from all sides, pressing AFO even further back.
All Might saw his opening and charged forward again. "CALIFORNIA SMASH!" he bellowed, unleashing a devastating punch that caused the air to split and a blinding shockwave to erupt as it connected.
AFO staggered, blood dripping from his mouth, but still, he stood tall. He grabbed All Might's arm, his other arm morphing into a massive claw. "Impressive. But still not enough!" He swung his clawed arm down toward All Might.
Before the blow could land, Tony's suit tackled All Might out of harm's way. "Don't go down on me now, big guy. We're just getting started."
All Might, managed a weak smile. "I like your spirit, young Stark. Let's finish this… together!"
Tony paused, a realization hitting him. "Together… that's it!"
"All Might, fall back!"
"What? But–"
"Trust me!" Tony reassured him.
All Might hesitated but nodded and leapt back, watching as Tony flew after him.
"I've got an idea," Tony said. "Let's merge our strengths! All Might, let's combine!"
"W-What?" All Might exclaimed in surprise as Tony's nanite suit split open revealing the empty insides and began enveloping All Might's body.
The nanites fused with All Might's suit, the swam all over his body, from his chest, to his arms and legs, enhancing every part of his body, and a glowing arc reactor formed at his chest glowing brightly. The suit's colors shifted to match All Might's signature design, with his golden hair tufts now armored.
All Might stared at his armored figure in awe before smiling widely and laughing in amusement.
Tony and All Might struck a flexing pose. "TOGETHER, WE ARE… IRON MIGHT!" Tony's voice declared proudly.
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