Bellamy and Clarke had known each other for the best part of their lives. Clarke was in the same class as Octavia in middle school and the pair quickly warmed to each other. Clarke's mother was a highly established doctor who spent a lot of long gruelling hours at work, leaving Clarke to spend the majority of her childhood shacked up at Octavia's house with her and her brother Bellamy. The blonde and the freckled boy had never really paid much attention to each other until Clarke's senior year when Octavia had too much to drink at their prom and Clarke had no other choice but to call Bellamy. He drove them both back to the siblings house where they shared their first kiss in the midst of a heartfelt conversation. The beginning of a 5 year long relationship. A relationship that ended as a result of the chemical outbreak which caused half of the worlds population to turn into brain-dead monsters. A relationship that ended the day Clarke was bitten.

Clarke looked at her arm and then at Bellamy. The vow they made long ago was lingering at the back of both their minds as they sat in an uncomfortable silence.

~four months into the apocalypse~

"If either of us get bitten we have to swear to shoot each other in the head," Clarke stated, blissfully unaware of the situation they would be in a year later.

"Okay, I promise," he replies, rolling his eyes, believing that the conditions would never prove themselves necessary.

They interlock their pinkies and seal it with a kiss. They had foolishly believed that the apocalypse was at its worst. That things could only get better. They had tricked themselves into believing that as long as they were together everything would be okay. The thing with possibilities, however, was that after the initial outbreak, the world seemed to be full of them and the only thing that truly kept them going was their motivated denial.

A year and a half had passed since they had made that promise. Their lives were riddled in loss after loss. Death after death. Grievance after grievance. They had watched the world around them disintegrate right in front of them; the only constant in their ever-changing lives had been each other. Despite their small shred of hope decreasing as each day passed, the challenges they faced only seemed to bring them closer and make their love even stronger.

They had been living alone in an underground bunker for the past four weeks. They'd only leave to find food or herbal remedies. Even then their expeditions would be no longer than an hour. This had changed when Bellamy had gotten the flu. A case Clarke had seen multiple times before at the hospital her mother worked at. A case that was a whole lot more serious in the midst of a zombie apocalypse.

"Stay here," Clarke urged whilst inspecting Bellamy's fever.

"What why? Where are you going?" Bellamy croaked out, prominent worry in his voice despite his illness.

"I'm just going to try and find some herbs. Your fever isn't getting any better and we've already been here way too long. We have to keep moving and we're not going to do that whilst you're like this," Clarke consoles, stroking a stray of Bellamy's curls away from his eyes.

Bellamy failed to understand that to Clarke, he was always worth the risk. She would give her entire life for him, a statement that had been true before the apocalypse had even began.
"Please don't le-"

"Bell, I'm going to be fine, okay? We're never going to survive if you're in this state. Just trust me."

And he did. It was arguably the only thing he was good at.

Several hours had passed. Despite the complete and unadulterated trust he had for Clarke, Bellamy knew that the apocalypse was unpredictable. They were never truly safe. Especially when they weren't together. He wasn't entirely sure what 'home' meant these days. But home felt a lot like her. And his home had just come busting in the door, blood dripping from her arm.

"Bellamy, I-" Clarke started, through staggered breaths.

"Clarke please don't say it..."

Bellamy could see the bite marks. But still, ignorance is bliss and he wanted to live in bliss just a little while longer.

"I've been bitten..."

Bellamy looked at the bunkers ceiling, caught in a daze. He and Clarke had become two halves of a whole. They had survived this long because they complete each other in every sense of the phrase. Life without her was unimaginable. He had convinced himself for the longest time that they were soul magnets, destined to spend eternity surrounded by each others energy. But now that death was staring at them, all of their midnight promises and unfinished plans became completely unattainable. They would not survive the apocalypse, and they would not see the day that zombies are eradicated. At least not together like they had dreamed of to keep them going through their darkest days.

"Bellamy... please look at me," Clarke begged, tears falling.

He slowly raised his gaze to meet hers. She reaches down to take the revolver from his belt, handing it over to him, gripping his hands between hers as she places a kiss to his lips. He was frozen in complete shock as he stared at her. The innocence of her face reminded Bellamy of the first day they met, Clarke's blonde ringlets cascading down her face from the tight ponytail her mother had clearly fashioned for her. Nine years had passed and she was still the same beautiful princess, only now she was tainted with grief and littered in battle wounds. He still loved her like she was the sun in his sky in a world that couldn't function in darkness. Life without Clarke wouldn't be life. It would be survival. It would be living simply for the sake of being alive. He didn't want that. He wanted her.

"Find Octavia, or a group or just find some shelter. You know how to survive. You have a big heart, Bellamy. Just be careful who you give it to, don't trust everyone. We've seen firsthand what misplaced trust leads to," Clarke chokes out, hands gripping his as they press their foreheads together.

"Clarke... I can't..." he responds, his lips trembling with unease. "I can't survive without you... I don't want to!"

~5 years pre-apocalypse~
Bellamy woke up at 12am to hear his phone buzz on his bedside table. Clarke Griffin is calling. Bellamy frowned. The only time Clarke ever called Bellamy was when Octavia's phone was dead and they wanted some money for food.

"Yes, O?" He answered groggily.

Although his little sisters late night calls from Clarke's phone were unwanted and annoying, he still cared about both of them and he was a sucker when it came to Octavia and her pleas.

"Um... no, actually. It's Clarke."

"Oh, right... sorry, I just assu-"

"Yeah, no it's cool. I get it," Clarke stated, her words slurring slightly from the standard intoxication that senior prom brings. "Um, so this is kind of awkward. Octavia has passed out in the girls toilets and we were gonna get an Uber from her account but I can't find her phone anywhere and if my mum saw me or Octavia in this state she'd completely flip out and-"

"I'm on my way," Bellamy said abruptly, interrupting her drunken babbles.

"Thank you so much, Bellamy. I owe you one."

Their ride home was comfortable. Not lively or entertaining or anything interesting, but not awkward or uneasy either. When they arrived home they both helped getting Octavia cleaned up and tucked into bed.

"How is it already 5am?" Bellamy thought aloud, looking at the clock that was displayed on the wall.

"Well, at least you know that Octavia is good at not letting people take her clothes off when she's drunk because that was a hell of a handful," Clarke mused, opening the Blakes' fridge and grabbing out some orange juice.

"Help yourself, princess," Bellamy stated sarcastically.

"I always do!"

Bellamy chuckled in response to a wink from Clarke and went to the living room to sit down. He had class in a few hours and couldn't see the point in going back to sleep.

"I'm not very tired yet, mind if I hang out with you?"

"Go for it, I'm just gonna wait until my class starts anyway."

Three hours passed and their conversation had gone from talk about Bellamy's history major to Clarke's dreams of being a doctor, to Octavia's irrational fear of Mr Wiggles as a kid and even as far as Bellamy's 6 month relationship with an older woman. The time ticked by unnoticed and the pair quickly realised they had a lot more in common than they thought. They had practically sworn each other off with Clarke being Octavia's best friend and all, but after three hours of getting to know each other on a deeper level it was clear that they had an undeniable connection. It was only fitting considering the connection Clarke and Octavia had themselves.
"You wanna know a secret?" Clarke said interrupting the flow of conversation with a flirty smile on her face.

"What's that?" Bellamy grinned, smelling the slight hint of whiskey on her breath.

"I've always thought you were like so ridiculously gorgeous. Like a Greek god or something. You're just like perfect, it's kind of unfair. I guess it must be a Blake thing."

Bellamy looked down, smiling from ear to ear. He was used to compliments, but coming from his sisters best friend who he'd secretly had a guilty pleasure for ever since she became of age, sent him into overdrive.

"That was a pretty good secret. Can I tell you one?"

Clarke nodded, biting her lip, eyes fixated on his as they edge closer together ever so slowly.

"I think that my sisters best friend is the most beautiful girl I've ever seen."

With that, Clarke closed the space between them, locking her lips with his. He snaked his arm around her hips, pulling her close to him as she moved her hand up to his cheek. They both pulled away gasping for air, keeping their foreheads touching as they stared at each other.

"I was talking about Raven, by the way," Bellamy joked, earning a chuckle and a playful slap from Clarke.

Bellamy would give anything to return to that moment right now. To live for 5 minutes in a world where the only threat was the arrival of a new day, the sun coming up and the birds tweeting, interrupting their meaningful thoughts.

"You need to do this. For me. For us."

Clarke pulls away, leaving the gun in his hand. He took a deep breath. He knew the severity of their promise and he knew that it was the right thing to do. But after two years of living a morally-corrupt lifestyle he wondered if there was such thing as 'right' and 'wrong.' However, he did know one thing for sure. He didn't want her to turn into one of the monsters out there. She deserved better.

He pulls the revolver up to her temple, tears falling so rapidly that he can barely see through them. He pulled off the safety trigger as Clarke closed her eyes.

"I love you, Bellamy Blake. May we meet again."

Bellamy's hand shakes furiously, he's completely blind to his surroundings now, unsure whether it's the tears or the sickness, or maybe just the pure horror of the situation. His finger just won't fucking move. He's pulled the trigger of this gun more times than he can count but killing her would blow up his entire world and shatter into a million pieces. Life just wasn't worth it without her.

"I can't do it... I can't just kill you, Clarke I can't. You deserved more than this. You can't just... die. You can't! I won't let you die alone."

"Bellamy, listen to me. You are going to survive this. You are going to fall in love again when the world is brighter and life seems reachable. You're going to see the new world order and have a family and achieve all of the goals we set together."

"The goals were set for us! Those plans are just empty unfulfilled promises without you. I'm nothing without you," Bellamy shouts, not out of anger but frustration and exhaustion.

The world after the apocalypse seemed pointless if she wasn't there to share it with him. He'd spend the rest of his life knee-deep in zombies if it meant that she was by his side.

He pulls her close, his grip tightening as he nuzzles into her neck. He whispers, "I can't lose you."

She pulls away from him, wiping her tears whilst gaining a facade of strength.

"Go. I'll do it."

"Clarke-"

"Please, Bellamy! Survive for me. Don't let me die in vain."

And with one last, starving kiss, Bellamy silently vowed to never let her down again. And for the next 6 years, he would spend every waking moment ensuring he never broke that promise. Every decision he made, every friendship he formed, every significant thing that happened in the years following were developed around the thought that Clarke was dead and it was his job to avenge her death by seeing the apocalypse through to the end.

But, the thing with possibilities, was that after the initial outbreak anything seemed possible. Not Clarke Griffin being alive, though. That was an unheard of possibility, but anything's possible in a world of the undead.