Bruce

A sigh of relief escaped Peter when he entered his Uncle Bruce's lab and found no sign of his baby brother anywhere. Just Uncle Bruce and his papa. He smiled really big and ran up to hug Bruce's legs, startling the poor man.

Bruce jumps, "Peter, you scared me. I didn't know you were in here." He commented looking down after patting the child on the head.

"Hi Uncle Bruce!"

Bruce smiles at him, "Hello Peter." He grabs the child under his armpits and hoist him up to sit on the work bench. "What brings you here?"

"I wanted to spend time with you today. Help you and papa work."

Bruce looks over at Tony and Tony smiles, "I'm sure we can allow you entrance to the lab for one day. And I think we could use an extra pair of hands."

Peter smiles and jumps off the table to go gather his miniature lab coat that Tony had gotten for him for a laugh when he was a baby. But Peter absolutely loved it and wouldn't work in the lab without it. He came back minutes later with the lab coat on and his mini goggles on as well. "What can I do Uncle Bruce?"

Tony smirks down at his son and Bruce laughs before hefting an engine on the table in front of Peter. Bruce pats the seat beside him, which Peter clambers quickly onto, before pulling the engine closer. "This use to be a part of an old 1978 Mercedes Benz 450SEL. Well it stopped working long ago, but your dad and I think we can get it working again. You want to help?"

"YEAH!" Peter says enthusiastically. And they get to work, the three of them until Tony is called away by Pepper. Soon it's just Bruce and Peter trying to find an algorithm to help stabilize the old engine.

They almost had it complete and hours passed before both boys were disturbed. A knock on the glass door interrupted their continuous banter. They were arguing about different stabilizing agents when they soon heard a soft giggle near the ground. Bruce raised an eyebrow at Peter and Peter shrugged. They heard it again and it caused both boys to look down. Peter frowned immediately while Bruce smiled proudly. There crawling two feet away from them was baby James with Steve trailing quietly behind. "He learned how to crawl?" Bruce asked standing from his stool.

Peter gave a wince of compliant when his uncle abandoned what they were doing. Steve smiled, "Yeah. He wanted to show Uncle Bruce and big brother in person. Huh James?"

James answers by a loud squeal of excitement. Bruce laughed and bent down in front of James. He reached out and his index finger played with James' chubby cheeks making the baby smile largely. James reaches up to grasp Bruce's finger tight in his tiny little hand. He then made a huge spit bubble that popped and splattered all over James' face and Bruce's fingers. Steve and Bruce laughed automatically while Peter cringed in disgust. He sighed sadly because now all the attention was on James and he was just another unimportant presence in the room, just as he always has been whenever James enters.

Peter sadly glanced back at the engine they were working on mere minutes ago. His index fingers traces the outside shape of it before he drops his arms limply by his side and he slides off the stool. Hanging up his coat, and putting away his goggles Peter looked back at his father, his uncle and his brother sitting around the middle of the lab talking nonchalantly without giving a glance in his direction.

Of course, forgotten again. Peter thought sorrowfully. He turned away from the three and stalked out of the room without looking back. He went into his room for hours and didn't come out for dinner. But no one, except Natasha noticed.

When asked where Peter was after dinner, JARVIS said Peter didn't want to be disturbed. No matter how much Natasha wanted to ignore Peter's command, she needed to give him his privacy knowing he wouldn't listen to her if she wanted to talk to him. So she let him be, for now.

Tony & Steve

Tony rushed into his and Steve's bedroom in search of Steve. He carried a sleeping James in his arms and he silently cursed under his breath when there was no one in the room. It was empty.

Sighing, Tony shakes his head and runs out of the room, in search of anyone. Because if Steve wasn't in the tower, he was at SHIELD.

Tony was in luck that day because when he ran into the common room of his, Peter's and Steve's floor, he found Peter sitting on the couch watching TV. Peter looked up at the sound of Tony's arrival. He gave his father a small smile before frowning and turning away. As soon as Peter saw James, he looked away. Tony didn't seem to notice though.

He sighed in relief before walking up to Peter and sitting down next to him, at the edge of his seat. "Peter I need you to do a big favor for me. Can you be a big boy for me?" Peter glanced between the TV and his father three times before nodding and turning it off. He then turned his attention back to Tony. "Can you hold and watch James for me for a few minutes? Papa has to go see Uncle Fury downstairs for a few minutes, can you watch James?"

Peter frowns and looks down at his sleeping brother. "Cant Aunt Pepper watch him? Or Daddy, or someone?"

Peter didn't want to and he definitely didn't want to be alone with James. Especially today. But his father needed him and who was he to deny his father something. Sighing, Peter reluctantly nodded his head. Tony sighed and kissed Peter's forehead gratefully. "Thank you so much. Here take James. I'll be back soon, he's asleep so he wont be any trouble. And if he wakes up, watch TV with him. He'll be quiet." Peter nodded numbly and allowed Tony to place baby James in his arms. Peter cringed despite himself when the baby landed in his arms. Tony didn't notice though and smiled gratefully. "Thanks again." He said before rushing towards the elevator. Tony was gone within a minute.

Peter gazed down at James for a moment or two before placing James down on the cushion next to him. He wasn't going to hold him the entire time. He placed him down and, despite what he thinks of his brother, he placed pillows on either side of him to prevent him falling off and hurting himself. After his attention is brought back to the TV.

Minutes passed in silence and Peter prayed James stayed asleep until Tony got back, but unfortunately for him that didn't happen. James woke up after 30 minutes.

His little eyes blinked open and he let out a big yawn before shifting in his spot which catches the eye of Peter. Peter glanced at James whom was stirring awake then looked back at the TV, pretending as if he didn't notice James waking up. He continued to watch TV even after James sat up and looked at him. James mumbled something under his breath before getting up to his knees and beginning to crawl into Peter's lap. This forced Peter to focus his attention on James. He stared down emotionlessly at him and James crawled into his lap before smiling up at him. Peter didn't return the smile and frowned. He continued to frown at him and the TV was forgotten after that because both brothers didn't look away from each other. James was confused as to why Peter was frowning at him and stopped smiling, opting to just continue staring at him with a confused expression.

The two brothers were soon interrupted by the elevator dinging and Tony stepping out with Steve close behind. Peter sighs visibly before grasping James tighter in his arms. He then jumps off the couch and walks towards them. When he gets in arms distance, he holds James out for Steve to grab.

Steve smiles and takes James from Peter, "He getting heavy for you Peter."

Peter shakes his head, "No." is all he says.

"Thanks for watching him for me buddy, I told you I'd only be a little bit."

Peter shrugs and smiles up at Tony, "Now you owe me." The 6 year old says in his high pitched voice.

Tony raises an eyebrow, "I do?"

"Yep!" Peter giggles then turns to Steve. "You too daddy."

"Okay." Steve gets down on one knee, placing James down on it before giving Peter a look. "What do we owe you?"

Peter thinks about it before a large smile lights his face. "Aunt Pepper promised to take me to the art museum I wanted to go to months ago, but she didn't take me. You couldn't because you said you were bed rested, but now you're not and I really want to go daddy. Please, please, please, please!"

Steve smiles and grabs Peter's chin, "I think we can arrange something."

Peter smiles, "Really!?" He asks excitedly.

"Sure."

"Papa, will you come with us?" Peter asks turning to Tony.

"'Course I will bud. You, me and papa."

Peter's eyes glisten with excitement. "No James?"

Tony shakes his head, "James can spend the day with aunt Pepper while we go."

"Promise we'll go?" Peter asks.

"Promise. We'll go tomorrow morning." Tony says.

"Pinky swear?" Peter says sticking out both his pinky fingers. One for each of his fathers.

Steve and Tony glance at each other before reaching out and taking their respective pinky. "Pinky swear." They say simultaneously.

Peter beams up at them and runs off to his room to get ready for tomorrow. He was happy that someone was finally paying attention to him and he was glad it was his fathers.