Prompt: "James discovers Sirius fancies Marlene but Sirius begs him to keep the secret and not tell anyone."

Pairing: Implied Blackinnon, Sirius James friendship.

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"Padfoot."

"Paaaaadfoot."

"PADFOOT!"

Sirius tore his attention away from the pretty blonde to James, and arched an eyebrow.

"What?"

James grinned. "You were staring at her again."

"Was not."

"Was too."

"You're delusional, Prongs. Getting snogged by Evans on a daily basis has messed with your head."

James tutted. "Denial, mate, you're in denial."

Sirius scoffed. "What am I denying, exactly, oh wise and wonderful Potter?"

"That you fancy McKinnon," James replied cheekily, smirking.

Sirius laughed dryly in an attempt to end this line of conversation. "McKinnon? Please. She's fit, sure, but fancying her?"

James grinned in delight. "Oh you so fancy her. Denial is the first stage of true love! Just look at Evans."

"I do not fancy McKinnon."

"Do too."

"Don't."

"Do."

"Nope."

"Yes."

"I really don't."

"Stop denying it, Padfoot, you'd be cute together. Probably a tad destructive, but adorable really. You're probably the only two people in the world who can actually handle each other." James stared pointedly at Sirius, who rolled his eyes in return.

"I still don't fancy Marlene."

"You've got it bad, Padfoot."

"I do not!"

"You do too."

There was a pause. Sirius sighed, looking wistfully at Marlene.

"I know," he admitted quietly.

"I swear on my mothers' life that I won't tell anyone. Except maybe Moony and Wormtail, possibly Evans…"

"If you even think about telling anyone, so help me Merlin, James, I'll-" Sirius growled and James laughed.

"Oh, Padfoot, it's time for you to get a taste of your own medicine. I suffered six years of hell at your hands about Evans, and now it's time for me to return the favour."

Sirius glared at James. "I am going to kill you."

James just grinned. "Sirius and McKinnon sitting in a tree…"