Held Together With String

Promises Ain't Shit if You Don't Pinky Swear.

For once in his life, Wade was quiet, glaring dangerously at the man in front of him. His hands shook and he fumbled with a blanket, wrapping the naked toddler up in it. It was taking every once of will power not to maim and kill the man in front of him. But he made a promise to Spidey, to Peter.
Minutes before Wade had bust down the doors of a warehouse to reveal a dirty little girl and a man holding her. The man was not her father, brother or uncle, but her kidnapper and rapist. In one fluid motion, Wade pulled him away and punched him as hard as he could, knocking him out. He dragged the man-creature-towards a chair, and pulled ropes tight against his wrists.
Kill him.
He deserves worse. White stated, ever the voice of reason.
Wade shook his head, and his voice trembled, "Spidey said no."
He's young and naive. Don't listen to him. Yellow hissed.
You want to.
Wade ignored the boxes and walked over to an old police radio. He fumbled, again, with the switches and managed to turn it on.
He spoke softly as he gently sat next to the tiny girl, "I am sitting next to the little girl you are looking for. She is safe, but if no one comes to get her quick enough, I will be forced to do unspeakable things to her kidnapper." He glanced at the unconscious man across the room and placed the microphone back on the table. Turning to the girl, he spoke as calmly as he could, "I'm Wade. You're gonna be okay."
~
Peter had been perched high above the city when Wade called in. He almost fell off the roof when he heard Wade's voice crack. And when he heard the rage barely being suppressed when Wade announced he would hurt the man, Peter took off. 
Swinging through the city, he let his spidey-sense guide him, as Wade didn't mention the address.
As the cold air whipped his face, Peter thought about his best friend. Wade had been struggling now for months, to get his anger and itchy trigger-finger under control. He knew that Wade was sensitive about kidnapping and rape, and he frowned. Wade had been through so much, and he let his past control him for so long, but he was trying. He tried so hard to be a better person. Peter knew he'd be faced with a broken man when he arrived at the docks. But what laid before him broke him.
Wade was being held together by strings. He was shaking uncontrollably, and doing his best to not wake the toddler, asleep in his lap.
Peter raced inside through the window and down the wall, only slowing down when he hit the floor.
"Deadpool?" he called tentatively. Wade's heard jerked up and when he saw Peter he visibly relaxed, "Spider-man,"
He never calls me that.
Peter nodded, already having called the police when he arrived, "Thank you."
He turned to the eerily silent kidnapper, "He hasn't said a word." Wade rasped.
Peter turned to look at Wade, and he could practically see his vision turning red. He walked over to the sleeping little girl, gently picked her up, and carried her back over to the mercenary. Wade nodded in understanding, reaching out to take her, before he paused and slowly lifted his hands back to his face, taking off his mask.
"The mask is scary." he simply stated. Stepping close to Peter, he enveloped the girl in strong arms, and Peter couldn't help but shiver as Wade drew away. He watched as Wade carried the girl outside, past the man.
"Jesus fuck. That's ugly." the man hissed.
Peter whipped his head towards him, "What did you just say?"
The man squared his shoulders, showing bravery for the first time, "That thing is disgusting."
Peter stalked over to him, "Listen here, you pice of shit, I don't know who you think you are to talk about someone like that. Deadpool is one of the sweetest, funniest, most unique person I know and love. Clearly you don't know what that is, of course, seeing as how you kidnap kids and use them to fill your cold, dead heart."
His speech was interrupted, however, when Wade stuck his head through the door, "We have to go."
Peter nodded, turned back to the man, and webbed over the ropes securing him in place for extra measure.
Back outside, the girl held one of Wade's knives tightly in her hands. Peter removed his mask and crouched down beside her at Wade's feet, "Hi I'm Spiderman. Everything is gonna be okay now, but we have to go. The police are coming to help get you back to your parents, okay?"
The girl nodded, eyes wide, "I can hear them now."
"Good! Stay strong, pumpkin! We'll be right over there if you need us." Peter smiled pointed at a stack of cargo crates.
He wrapped an arm around Wade's waist, waved goodbye, and webbed them over to said crates.
The police came and went and Wade immediately sat down, hunching over his knees, "I'm sorry."
Peter dropped to his knees wrapping Wade in his arms, "Shh, no, you were perfect Wade. You did so good."
Wade shook as sobs began wracking his body, "Peter, I almost killed him. I almost broke our promise."
Peter stroked the textured head of his best friend cooing softly, "Wade, promises ain't shit if you don't pinky swear."
Wade raised his head, meeting Peter's unmasked gaze, and cracked a watery smile, "Peter Parker! Do you kiss your aunt with that mouth?"
Peter giggled and held Wade's head in his hands, studying his face. He sure wasn't anything pretty to look at, but Peter loved it all the same. He knew he couldn't change Wade, only he could do that, but Wade was perfect anyway.
The scars on his face turned blotchy and red and he realized Wade was blushing under his gaze.
Peter smiled lazily, "No, I kiss you with this mouth."
Wade's head jerked back in surprise, "Ex'squeeze me?"
"Wade," Peter whined, leaning close, "Please."
Wade began stumbling over his words, and Peter rolled his eyes, pressing his lips against the merc's.
Wade gasped and his hands flew to Peter's hips, deepening the kiss. Peter licked across the chapped lips and into his mouth, delighted to taste something purely Wade.
Wade pulled back, grinning, "You sure know how to make a girl feel not so murderous."
Peter snorted and leaned his forehead against Wade's, "You're perfect."