Booker x Male!Big-daddy-ish!Reader 5 (END)

They were ambushed every so often, Booker left it (Y/n) for the exact reason that he brought him along. Protection. When the halls were cleared he go and get the two. It was a gruesome sight to see what the boy had done, but it couldn't be helped.
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They ran from store to store, nothing seemed right. Every 'person' they found was either dead or dying. They couldn't wrap their heads around it, Until they heard it.

Groaaannnnnnn

The familiar groaning of a bigdaddy. A similar groan slipped from (Y/n)'s lips, just a bit higher pitched. Elizabeth clamped a hand over the boy's mouth. He gave a confused look.
"What are you doing!?" He asked in a hushed tone, though very stressed.
"We're supposed to let each other know we're here..." (Y/n) replied through the woman's hand.
"You'll get us killed!" Booker growled.
"No, no. We shouldn't--"
(Y/N) was quite literally pulled from the conversation and held tightly in a big-daddy's grip. A look of panic and stress suddenly flashed across (Y/N)'s face then his eyes went red. All like the times he had fought. A loud sound escaped his lips, much like a charging sound and he struggled, roughly pulling himself from the monster's grip, tearing his shirt and vest. Now most bruises, needle marks, and veins were visible. Elizabeth was terrified, Booker didn't know what to do.
(Y/n) charged, taking the big-daddy with him though a large mechanical door that had not opened on time. It was ripped from it's hinges with a loud sound of ripping metal. The monster fought back, throwing the smaller man to a wall, knocking the wind right out of him. (Y/n) struggled to his feet, wheezing and trying to catch his breath. He reaches to the mask which had been permanently secured, it crumbled in his hand and he shot up to look at the monster. He casts the tattered remains of the mask away and runs at the thing, trying to bring it down again.
My lungs are stinging...
He continued to fight with the creature for quite some time, Booker tries to help where he can, distracting it, but to no avail. It is focused on killing the boy. "Run!" (Y/N) wheezes out and climbs the back of the big-daddy, pulling out cords and wires here he can. Liquids drain from it and it slows down until it is on the ground, flailing, trying to move. 
Stinging...
(Y/N) swings one last time, his hand going through the diving mask and making a sickening crunch when it meets skull. He pulls his arm out and stands up and straight as he could...
before collapsing next to it. Booker rushes over and so does Elizabeth. Booker pulls the boy's head into his lap, "Hey, what's--what's wrong? You won. Right?" He manages to get out, obviously worried though.
He gasped loudly.
Burning...
"Booker, his mask..." Elizabeth mutters and hold the remains of what she could find, the last of it crumbled in her palm.
"That--That shouldn't be important right?" Booker's speech becomes even more frantic and worried.
"Boo...ker." (Y/N) reaches up though misses his target and only reaches upward. Booker takes his hand.
"What? Come on. We gotta keep going. Get up so you can protect us again."
"Hurts...." He wheezes.
"What does?" He asks softly, "Elizabeth, do something!" Booker's tone is harsh to the woman.
"Can't breath..."
"Booker, the mask let his breath. He can't breath." Elizabeth replied quickly and pressed a hand to where the boy's left lung should be. (Y/N) groans quite loudly in pain. He then coughs and black liquid drips down his chin.
"Oh god..." The moan pulls her hand back.
"What--What is it?" Booker says frantically, gathering the man in his arms and picking him up. "We gotta do something!"
"Book--AGHHH!" (Y/N) yells at the pain in his lungs. "St-stop! C-can't--" He tries to speak but the coughing only starts up again.
Elizabeth remembers this from a medical book she read, it was a bit odd to diagnose him but she could at least try.
"It's cancer."
"What?" Booker looks up from the man.
"Lung cancer. The mask helped contain it from getting worse, but it also stopped it from getting better." She repeated in more detail. "Put him down... I'm going to try something... and you're not going to like it." She was planning on using her power to give the man a new set of lungs. She wasn't even sure if it worked that way, but seeing as her and Booker could travel between dimensions, she had to give it a try.
"What are you going to do? I can't do anything, what makes you think you can?" Booker growls and sets the boy down gently. (Y/N) is neatly unconscious by now.
She places her hands on both sides of his chest and focuses. A tear forms just around (Y/N)'s chest and, though it is a disgusting sight, there is a fresh pair of lungs. Booker is taken aback but he does not move from his place. Now she focuses on replacing the cancerous ones. It's a gruesome thought, she hates it in fact, but she's saving her friend a world of pain or worse, death.
She pulled her hand back and the tare closes violently. (Y/n) is still unconscious. She leans in to listen to his breathing. It is more or less clear. Booker stares in awe then gently picks up the boy, "We have to-- We have to leave. We have to get out of here. I can't go through with this deal. We need to get him to a doctor and soon or else--"
"I know. I understand." Elizabeth stood and brushed off her skirt, then wiped the blood from under her nose. Booker had been her target all along. But, she guessed she could let him live. If there were universes like this where Booker cared for someone, even if it was not Elizabeth, she could let it go. It was just nice to see him so worried.

(Y/N) gasped in Booker's arms and gripped the front of the larger man's vest tightly. He opened his eyes and... much to the surprise of both Booker and Elizabeth, they were (E/C).
"Book--Booker?" The boy spoke quietly, but his voice was clearer than it had ever been, and Booker couldn't have been happier. He pulled (Y/N) close and... kissed him. Elizabeth gasped and her eyes widened, then a small smile spread spread on her lips. The (H/C) haired man kiss back, clumsily pressing his lips to Booker's.

Booker had been her target all along. But, she guessed she could let him live. If there were universes like this where Booker cared for someone, even if it was not Elizabeth, she could let it go. It was just nice to see him loving someone again. To let himself let go of his past and focus on the person in front of him. One Booker and maybe a few more like him could do this. After all, there's bound to be more (Y/N)'s.