Shortly after, the building rocked, and shook with explosions from the outside. Several people stood up in alarm.
"The building is under attack!" Genos exclaimed.
"That's impossible!" Darkshine replied, "This is the Hero Association HQ!" Another explosion rocked the building. You crossed your arms and closed your eyes, images of a large ship, a multi-headed alien, and absolute destruction flashed by. Slowly, you reopened them.
'Seems like Madame Shibabawa's prediction came sooner than she thought. No wonder she died.' A few seconds later, a great explosion rocked through City A. It didn't damage the building, but you all could feel the enormous shockwaves clear as day. The power went out. You stood up.
'Might as well go check it out.' Without saying a word to the others, you disappeared from the room and reappeared on the roof of the building. You took a moment to process the scene you were looking at.
'Oh wow, that's uh... that's interesting--' Just like in your flash vision, the entirety of City A was destroyed, along with a giant ass alien ship hovering above you. In less than a minute, Saitama also joined you.
"That's big! Are they aliens?" He said from your side.
"I've never seen anyone on earth construct this, so probably," you replied. You and Saitama flew towards the closest area of the ship, however, it glinted. A giant bullet flew towards you two, which you dodged easily. Then a barrage of bullets came at you. Saitama deflected one with his foot. The outline of the bullet coming towards you turned purple. It stopped, spun around, began to spin again, and you launched it back where it drilled a hole into the ship.
'So they destroyed City A with those, huh.' You glanced down.
'There's a powerful monster under there.' You sighed.
"Y/n," Saitama said, "Let's go beat up some aliens."
"Awe fuck yeah!"
~
You and him ran through the ship's halls, destroying any alien that came your way. Saitama was also making himself useful by punching and destroying random walls. Why, you didn't know, but it would probably help you later. You and him ran down another hall, when a laugh from your right stopped you. An alien stood on a wall."Well done making it this far, intruders!" It said, "But this is the end--" Several purple blades skewered out from its body, sending it tumbling back over the wall.
"Idiot," you muttered as you and him jumped over it. While Saitama punched and kicked in the walls more, you used your power to crumple up the surroundings into a ball, and send them flying into different directions.
"Isn't it about time the boss showed up?" Saitama asked.
"I know where it is," you replied from his side. "Just keep destroying shit." A large purple gun appeared in your hands, and you shot it off, rocketing psychic lazers into the walls and ceiling.
~
"Saitama, we've been at this for a while," you said, "I don't think anyone's gonna show willingly.""Well we still have to try, right?" He replied.
"I'm saying that because there are several living things here, but they're not intercepting us anymore." You looked around. You and him walked to a fork in the hallway, staring at which way you should go.
"That's weird," he suddenly said. "I hear a voice right inside my head." You blinked.
"Really?"
'So we have another... 'ESPer' like Tatsumaki.'
"Even if I wanted to get out, I can't! I've lost my way!" Saitama yelled to the invisible voice. "... a right?" He turned to look at the hall.

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Art of Manipulation |One Punch Man| |Reader Insert|
FanfictionSaitama - A hero for fun who has inhuman physical abilities and can defeat enemies with ONE PUUUUUNCH. Genos - A hot, edgy cyborg that can shoot lasers and fire. Y/n - A sadistic hero with powers that she legally should not have. With abilities to...