(A/N) This is based off a theory for Avengers four where Tony dies, sacrificing himself for Peter. It's kinda depressing, so be warned. Enjoy!
He stared up at Thanos, his hand gripping the nanotech sword he had created. It was his own invention, a machine he could use to kill a god, or, in this case, a titan.
He looked around at his comrades, most of them injured or being held back by the force of the power stone. It was all up to him now.
"Anthony Edward Stark." Thanos's booming voice rung in his ears. "Look around you. What do you see?"
Tony stared up at him, refusing to bend to the weight of hopelessness that was threatening to collapse on his shoulders. "I see a man who deserves to die. A man who killed children, parents, friends..." he trailed off, thinking about Peter. "A man who killed a brave young fighter for their own benefit, and slaid many others out of menace and cruelty." His face hardened, and he gripped the blade even tighter, his knuckles turing white. But he could not attack. Not yet.
Thanos smirked down at him. "Is that so? Well, I see a man crippling in defeat. You know it's worthless, Stark. Give up now or face the consequences." He turned towards the Avengers.
Tony grimaced in the pain of his many wounds, bracing himself. "Do you really think I'd let that happen?"
The larger, purple-skinned man turned back towards him. "Would you?"
Before he had time to say any more, a bolt of lightning struck down from the sky, hitting Thanos. He screamed and looked up at Thor, who was now coming down towards him. He jumped on top of Thanos, bringing him to the ground. Without hesitation, Tony leaped up and sunk the blade deep into his neck.
"That's what you get for killing Peter."
Thanos groaned in pain, slumping farther to the ground. Tony dug the blade deeper.
"And that's what you get for killing the rest of them."
The titan gave one last shout of pain and fell to the ground. Tony took the blade out of his neck. "How does it feel?"
Fatigued, Tony took a step back and crouched on the ground, breathing heavily, his various wounds still trickling blood.
He turned around, beginning to walk away. "Tony-" came Thor's deep voice, but it was too late. In less than a second, the sword used to kill his greatest enemy was sunk all the way through his chest. He gasped.
The barrier preventing the other Avengers from getting through fell, and everyone in the field rushed up to Tony.
"Tony..." came Steve's voice, sounding fainter by the second. Judging by the size of Tony's wound he could tell it was too late to save him.
Tony, his eyelids slowly closing, gripped Steve's hand. "Take care of Peter..."
His eyes closed for the final time, welcoming the darkness around him.
---
The battle was won. Thanos was defeated. Steve and the others looked around in pain and confusion. They had won the fight, yes, but they didn't feel any true sense of victory. Natasha gripped Tony's limp hand, and a single tear fell down her cheek.A slight wooshing sound aroused them from their mourning, and they all looked around them. Slowly but surely, swirls of dust materialized around them, forming the people that had been taken from them a year ago. King T'Challa, looking at his hands, as if wondering if they are real. James Barnes, whose eyes find Steve's almost immediately. Wanda, who still looked sad at the loss of Vision. The rest of them came after, looking confused or exhausted.
Then there was Peter. The young teenage boy seemed almost as if he was waking up. He looked around, at his legs, his arms, the rest of the Avengers. He seemed in awe almost immediately.

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Peter Parker/ Avengers Oneshots
FanfictionJust a collection of thoughts that I turn into random stories. Most of these will involve Peter because he's a precious lil bean and my favorite. Some of these are super sad so I'm sorry, but a few are also happy. Anyways, comment what you want me w...