So this is a short, slightly different version of the full length story I am writing, based on the same idea, called 'wonderful life'. Enjoy!
if today was your last day – nickelback
Jackson has cancer. They've known this for the past six weeks. Some days, he's in extreme and agonising pain and all Stiles can do is sit with him, and he feels so fucking helpless. At first, they thought that the werewolf healing powers would solve everything, but it seems that healing cancer is not something that werewolf healing can do. Which fucking sucks, but what can you do? Stiles thinks. So they have to rely on the doctors.
And, fuck, it scares Stiles; to think that maybe they won't be able to save him. To think that maybe Jackson will die. And whenever he starts to think like that, he has to force himself to stop, because they have the best resources and opportunities on offer (see, there are some benefits to being as rich as Jackson's parents are), and Jackson will survive. He's a stubborn bastard like that.
When Stiles suggests the bucket list, Jackson rolls his eyes. And moments later, Stiles finds him writing one. He doesn't say anything, but Jackson glares at him all the same.
He gives the list to Stiles the next day. Stiles takes it and scans down the list. It's only twenty items long, and the twelfth is get married. "Get married?" Stiles asks. Jackson shrugs, embarrassedly. The rest of the list is mainly sensible. Go skydiving seems a little extreme to Stiles, but he's willing to do it if Jackson wants to. Jackson stands up from where he has been sat at the kitchen table. He stands behind Stiles and wraps his arms around Stiles' waist, resting his chin on Stiles shoulder. Stiles relaxes back into Jackson. "Have you told anyone else that you want to do these things?" Stiles asks.
"No," Jackson breathes in his ear. "Just you. I want to do them with you."
"Even number twelve?"
"Especially number twelve." Stiles' heart thumps against the inside of his chest faster. Jackson can obviously hear it, because he laughs, gently. "Why would you think otherwise?" Stiles shrugs. Jackson holds him tighter.
"Will you marry me?" he whispers in Stiles' ear.
"Technically, it would have to be a civil partnership, and we'd have to ask permission from our parents..." Jackson laughs.
"Just answer the question, Stiles."
"Yes." Jackson spins Stiles around in his arms. He looks surprised, as if he never expected Stiles to accept his proposal. Stiles smiles. "Yes, really, I am serious."
"It's not just because I have cancer is it?"
"Part of it's because of that. I mean, I'm accepting now because you're asking now because you might not otherwise get a chance to. But I would marry you any time you asked, Jacks." Jackson kisses him in response.
The wedding is not really a wedding so much as a party where Stiles and Jackson just so happen to get married. Neither of them minds though. They slow-dance around the dance floor, completely and utterly wrapped up in one another. "I won't ever regret this," Stiles whispers in Jackson's ear. Jackson smiles.
"Neither will I."