So I really think a disclaimer is no longer necessary, but the ideas are form letterstomrpotter. Tumblr. com. , and the characters belong to J.K. Rolwing.

Dear Regulus

Lily gave James' hand a quick squeeze for support as he eyed his best friend sitting in the corner laughing over something Remus had just said. He had just returned from a meeting with Dumbledore, and knew he would have to go over and wipe the grin off of Sirius' face. He gave Lily a quick kiss on the cheek, and gently patted her slightly protruding belly before making his way over to where his friends sat.

"Prongs!" Sirius greeted, catching sight of James. "Wait until you hear this! Moony and Wormy –" His grin faltered at the look on James' face. "Prongs?"

"Padfoot I-I need to speak with you," he glanced around the room, milling with Order members. "Perhaps we could go somewhere a little less crowded?"

Remus caught Sirius as his knees buckled. No. Not Reg. Anyone but him. Sirius waited for James to crack a grin and tell him he was kidding, so that he could beat him to a bloody pulp for even joking about this, but James just cast his eyes to the ground.

"I'm so sorry, Padfoot. I know you weren't close, but he was your brother."

"It can't be true. You've made a mistake, Prongs."

"Dumbled-"

"THEN DUMBLEDORE MADE A MISTSAKE!" Sirius shouted, causing his friends to wince.

A knock sounded at the door, and Lily stuck her head in. She looked at the helpless looks on Remus and James' faces, before transferring her gaze to Sirius' tear-streaked face. She entered the room, leaving the door open behind her. She nodded once to Remus and James, who glanced at Sirius before leaving him alone with Lily.

"Padfoot?" She questioned gently, crossing over to him, and laying a hand on his shoulder.

"He was so young, Lils. Eighteen years old."

Lily took him in her arms, and he began to shake with silent sobs.

"I know, Padfoot, I know," She soothed. "Now. I want you to look at me so I can tell you something."

Sirius looked up from where his head was buried on her shoulder.

"Dumbledore's source within the death eaters says that Voldemort killed Regulus because he didn't want to be a death eater anymore. He didn't agree with what was happening, and he was brave enough to admit he wanted out. You're more alike than you think. "

Sirius cracked a tiny, grateful smile before hugging his best friend's wife.

"Thanks, Lil."

I think you are a really brave person. I'm really sorry I never had the chance to show you how proud I am.

Sincerely,
Sirius

I'm not 100% thrilled with this. I really struggled with it. Thoughts are appreciated.