Harry Potter: Always a Woman by Sam Vimes

[coprime_recs]

Always a Woman (Remus/Sirius | NC17 | 3,002 words) does Sirius/Bellatrix in about the only way where I can see it as plausible. Remus has sex with Bellatrix; Sirius confronts her. The story's deliciously messed up and creepy while still having a bit of a happy ending. Incest should be dark like it is here.

Excerpt:
"I didn't mean it that way, and you know it."

"Didn't you?" she asked, standing. He turned, in order to stay facing her, as she circled the table. "You're slipping, Sirius."

"Just because you don't know how to have friends without sleeping with them or buying them -- "

She clapped her hands delightedly. "Much better!"

"Fuck you, Bellatrix."

"Mmm, Remus certainly did." She reached out to tap him on the nose, something she'd done when they were children, and he caught her wrist. "Strong man. Yes, you're much more grown up than he is."

"You stay the hell away from him or so help me, Bellatrix -- "

"Don't you want to know?"

That stopped him in his tracks. The finger she'd extended curled against her palm, her wrist still in his grip. He watched it, fascinated.