Author's Note: Shoutout to RobinNicole and SweetReverie13 for the reviews! Thanks for reading.

This story is now complete. Go to my profile to find other stories in the Waxing Moon series.

Interference

Lily and Regulus stand in silence as they watch the scene play out between Sirius and Severus. The second kiss lasts much longer than the first. When Severus's fingers start threading through Sirius's hair, Lily tears her eyes away at last. Her gaze lands on Regulus, who has moved to stand beside her.

"It appears you were right about them," Regulus says. His eyes are unreadable.

"Your plan was clever," Lily replies. "I'm impressed with your timing, actually. How did you manage that?"

"I've had a lot of practice winding my brother up."

"I see." Lily turns her head, seeking something to look at other than Regulus or the boys having a tongue war in front of her. She notices with amusement that Potter and Remus are among those watching the unusual event.

"I've never realized Gryffindors were so good at interference," says Regulus.

Lily slowly turns her gaze back to her companion. "Severus likes to say that I should have been Sorted into Slytherin."

"I can see why."

When did he get so uncomfortably close? Lily bites her lip as Regulus leans even closer, his breath warming her cheek.

"Do you think they'll last?" he whispers.

"I hope so. It will be good for them. What are you doing?" Lily doesn't raise her voice, but there's a sharpness to her tone that Regulus seems to recognize. He recoils.

"I was just wondering why you came to me, of all people," he says.

"Because you're Sirius's brother."

"You could have asked Narcissa. She knows him at least as well as I do."

Lily shrugs.

Regulus steps forward again and cups her face in one hand. He presses a chaste kiss to her lips.

"Something to think about," he says, and then he walks back into the castle, leaving Lily to stare after him in bewilderment.