Just starting out with two chapters right off the bat so you have more than a few hundred words to read enjoy
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Chapter 2
As Tony stood at the top of his tower watching the utter chaos unfold below, the last person he would ever have expected to walk onto the rooftop was Y/N. But, it was Y/N that walked out of the stairs, hair blowing dramatically in the high wind.
"…Am I dreaming?" he asked, sure that his three days of no sleep were playing tricks on his mind. Y/N shook her head.
"Tony, tell me what's going on," she demanded. His blood spattered immortal friend had a kid with a runny nose on her hip. He pushed aside his disgust, because when you've doomed the human race you don't really get to be grossed out by kids…
"Um… come inside, I'll tell you everything," he said.
He didn't have to. The shameful look on his face told Y/N everything she needed to know.
"No time," she interjected seemingly oblivious to the kid wiping his nose on her shirt. "Can you fix it?"
"Yes, but it will be too late," Tony sighed. "I've been listening to the radio, somehow this virus has spread worldwide. Whenever somebody dies, they turn into one of these things. If they bite somebody, that person dies from the virus and turns into one of them. And they seem to like to tear people apart," he added, sneaking another peek over the railing at the gore. "It's like that TV show you watch. It's terrible." At his conclusion, the interdimensional traveler strode over to Tony and grabbed a large fistful of his shirt.
"You listen to me, mother fu-" she started, cutting off her curse as she remembered the dazed boy she was carrying. "Ffffffff..frog," she finally decided on. "You are the only person who can do anything to help right now. Pull yourself out of your guilt and do something! As long as we have a few people remaining, humanity is not over!" she yelled into his face. Shocked at the outburst, Tony nodded. "You are brilliant, you amaze me every day. Perhaps this is your fault. I can tell you right now, terrible things were going to happen eventually. It doesn't make you blameless, I know, but it means you're still a good guy. You've saved the world several times over! Get your butt in there and do it again!" she ordered at a higher volume than necessary. Tony gulped and started to go inside.
"Ok, yes, you're right," he nodded. The miserable expression on his face began to fade. If Y/N said he could do it, he undeniably could do it. And even if he lost the rest of the world… even if Pepper was already dead on her business trip, he could count on Y/N to be there for him. And the kid too, he guessed. "What's the kids name?" he asked as he began to calibrate his equipment.
"This is Jackson," Y/N said with a little more light in her voice, turning to her charge and bouncing him a little. Tony could swear that the kid had a bit of a smile on his face at the sound of his name. He would have smiled too if the situation had been different. He too knew firsthand how being around Y/N made bad situations that much more bearable.
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Steve cursed whatever force was in charge of dishing out the good luck. Of all the times for the Quinjet to break down, now was the worst possible time.
The news showed something that looked like The Walking Dead. He had watched a few seasons with Y/N, and apparently, these zombies functioned the same way as the ones on TV. A functional quinjet would be great right about now so that the Avengers could fly from their new complex back to the old Avengers Tower, but without Tony to fix the thing, it might be too late by the time they managed some makeshift repairs.
He brought out the van.
The Avengers piled in as he idled the vehicle out front. Warily, he eyed Bucky. Y/N had warned him that, because she had brought the brunet back to Steve before he was supposed to come back, that he could act unpredictably. Steve was most worried that his friend would forget that he was no longer running from Hydra when he was in the middle of this zombie nonsense. It had happened before in a moment of battle, and the Captain didn't want to have to track down his friend in this mess.
For now, Bucky seemed fine. He turned on the radio as he buckled himself into the passenger seat, and proceeded to sit there with his normal broody body language.
Steve turned back to the steering wheel. They had to get to Tony fast and make sure that he was safe while he whipped up a cure, that was priority one. Steve's secret priority number two was to use the Stone to try and summon Y/N back to this dimension. He felt like that was this world's best chance for survival.
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"Tony…"
Tony grunted noncommittally in reply.
"Tony!" Y/N said again, this time more urgently. Finally, the genius looked up. His attention was fully directed to his friend standing at the window when an unexpected explosion rocked the building. "Tony, they're bombing the city!" Y/N yelled.
"What!" he dropped his goggles and zipped to the window.
Sure enough, fighter jets were dropping explosives on the half human, half undead population below. "They can't do that!"
"They can and they are! Grab your stuff and get away from the windows!" she yelled, scooping up Jackson as she moved to the center of the room.
Tony had only just found the cure and was in the process of replicating it. As he scooped up the ready vials and an injection gun, a bomb hit the building, blowing the windows out.
Thrown to his stomach, Tony crushed the armful of vials he held to his chest. An inhuman scream ripped from his chest as he watched the fluid seep into the carpet.
"No! NO!" He rifled through the broken glass, looking for any vials remaining intact. Two. Exactly two remained.
A second bomb hit the building, and this time the foundation shuddered. This building, their safe haven for the past week, was coming down.
Tony inserted the first vial into the injection gun.
"Hand me the kid!" he yelled over the groans of the failing building. Y/N quickly handed him over and watched as Tony injected the vaccine into his arm. "You next!" Tony hollered.
"What? No! You use it! There's only one left!" Y/N yelled. She scooped up the shocked Jackson and started towards the stairs.
"No! Please!" he yelled at her receding form. Y/N wasn't one to put herself before others, and Tony couldn't think of any way to convince her to take the vaccine.
There was also the small issue that she was terrified of needles.
Tony got up and scrambled after her, grabbing the small suitcase he had prepared for if they needed to leave the tower. As they raced down the worryingly leaning stairs, he wracked his brain for any idea on how to convince his friend.
They reached the second to bottom floor. They walked out onto the viewing platform that let them look into the vacated lobby. None of the windows looking onto the street had been broken, keeping the stumbling bodies on the other side.
"We go out the back," Y/N decided. Tony knew that he would have to get the serum into her before she went outside if he was to do it at all…
Moving as quickly as his tired body could, he pulled Jackson out of her arms, set him on the floor and pinned Y/N to the wall.
"Oomf! Tony!" she yelled. Her eyes widened in absolute panic as he pulled out the injection gun. "Tony! Don't you dare!" Knowing that she was nearly as strong as he, Tony didn't wait to discuss the matter and pressed the instrument to her neck.
It was over quickly. Y/N's needle phobia overtook her, and she slumped quivering to the ground. Tony felt a moment's regret, but a growling from behind kept him from continuing the thought.
The Avenger's Tower receptionist had remained behind, apparently, and starved to death. Tony felt even worse, if that was at all possible, as the rotting form stepped hungrily towards him. He quickly fiddled with his watch, causing the repulsor glove to wrap around his wrist. One quick shot dispatched the threat.
Turning around, he saw that Y/N still hadn't gathered herself. Jackson was worriedly patting her hair as she tried, very transparently, not to cry. Tony pulled her up. She had only been like this a few times, most as a result of needles, and waiting for her to get over it would result in a building on their heads.
Tony pulled his best friend and the kid out of the back door, and stopped to open the suitcase. From the contents, he pulled out the compact version of his suit and put it on. Scooping up the two and grabbing his suitcase, he froze momentarily at a particularly loud groan from the building above.
He turned around just in time to see it falling… right in their direction.