Anyone who's looking for a gorgeous Dursleys story, look no further than here. nimori's fic is part of a larger universe, but it's still an excellent read, even if you haven't followed the rest of her Memoirs universe. Quite squicky and meant for adults, just to warn you.

Title: Baby's in Black (Come Together 11)
Words: 1371
Pairings: Sirius/Bellatrix, implied Regulus/Bellatrix
Rating: NC-17
How the song influenced the fic: A song couldn't possibly be more perfect for Blackcest, especially the Bellatrix centered kind. Lyric that stands out: "Oh dear, what can I do?/Baby's in black and I'm feeling blue/Tell me, oh what can I do?" Full Lyrics.
Author's Notes: Notes and disclaimers on the first story. Sirius is home for the holidays and gets an early present, in the form of a very manipulative Bella. Incest warning. If you're under the age of 18, you shouldn't be reading this. It's not the most graphic thing I've ever written, but the implications are very strong and the story is definitely smutty.
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He'd been home for Christmas hols exactly twenty-two hours and Sirius was already hiding in his room. Pitifully, he gazed at his surroundings, decorated in Slytherin green and sighed. This never looked right to him. Sirius sat in the picture window and stared out at the magically created landscape. Snorting, he wondered when exactly 12 Grimmauld had become a beach side resort.

Sirius hated Christmas.

He was startled out of his brooding by three exact knocks on the door. There was no yelling, so it couldn't have been his mother. Regulus, for all his posturing, was still mostly afraid of his older brother, so he wouldn't dare try to bring Sirius out of one of his snits. The idea that his father might be home was so inherently comical that he rejected it in seconds. Eliminating the usual suspects, his curiosity was piqued and he jumped up to answer the door.

"Oh. Hello, Bellatrix." Sirius's cousin was three years his senior and one year out of Hogwarts. With Bella finally out of school, Hogwarts was even more appealing than usual.

Bella peered through the doorway and leaned casually against the frame. She was in all black, despite the holiday season. Based on her dress robes, Sirius assumed that the guests had started arriving for the Black Family Christmas Party. He scowled at the thought of his assembled family, while trying to ignore the large amount of visible cleavage his cousin was sporting. Who is she trying to impress? he thought bitterly. It's just family tonight.

"Sirius, invite me in or hex me through the floor already." Bellatrix looked impatient.

He considered his options for a split-second before sighing and nodding. He jerked his head in the direction of the room and said, "Come on in."

Bellatrix strode in and sprawled herself across Sirius's bed. He tried not noticing that her dress robes had ridden up to her knees. She patted the spot next to her and he stiffly sat on the edge of his bed. Bellatrix laughed her sweet, tinkling laugh. It was the same laugh that - when they were younger - would make Sirius want to do whatever she asked. Rolling over onto her side, she asked, "Sirius, how's Hogwarts?"

Sirius swivelled around to face her, unsure of her intentions. "Fine," he replied quickly.

"And your friends?"

"They're fine," said Sirius. Bellatrix had something up her sleeve, he knew, but he couldn't bring himself to make her leave.

"Have a girlfriend? A boyfriend?" Bella kept talking without letting Sirius answer. "Maybe one of those friends of yours is a little more? Let's see. Not the Evans girl, of course. She's a Mudblood and despite your holier-than-thou Gryffindor ways, I bet you still wouldn't date a Muggleborn. You are a Black, after all." Sirius was about to retort before her laughter started again and he wilted. "Maybe it's the bookish fellow. Cute. Lupus? Lupee..." She struggled to remember.

"Remus," Sirius supplied.

"Ah, yes. Remus Lupin. Right. Seems a little boring to me. Potter, then?" Sirius eyes widened. Did she...? "No." Sirius bit back his sigh of relief. "He's too much like you. Too much like you, but not good enough for you."

Unable to hold back, even though he knew she was baiting him, Sirius asked, "What do you mean by that? James is the best friend I've ever had!"

"Mmm," said Bella, noncommittally. "But he's still beneath you. So righteous, boring. So Gryffindor." Like most of his family, Bella said this like it was an Unforgiveable. "Too plebeian. You're a Black. You deserve the best."

"I have the best. I don't think I'm better than anyone else," said Sirius petulantly.

"You should. You can't escape who you are." Bella put her hand on Sirius's arm and began rubbing his forearm. Then, she pushed up the sleeve and began lightly tracing patterns on his inner arm with her fingertips.

Sirius nearly groaned at the action. This is wrong, he thought.

Bella propped herself up on her other hand. "Look at me, Sirius."

Against his better judgment, he did. Her dark, heavy-lidded eyes bore through him. She leaned up, so that their faces were centimetres apart. "You can have the best, if you want it, Sirius," she breathed.

Sirius's eyes fluttered closed when he felt her lips slide over his. This is very, very wrong, he thought. Merlin, I hope the door is locked. As her tongue slid into his mouth, his eyes flew open again and he moaned into Bellatrix's mouth. Sirius cursed his body for not listening to his head as he realised he now had an insistent hard-on.

Bellatrix kissed down his jaw and his neck, before moving up to his ear, where she bit down - not hard, just enough for Sirius to loudly vocalise his growing desire. Hungrily kissing him again, she began undoing his robes and he thought Stop, stop, stop!, but his hands moved independently of his thoughts and he began undoing the clasps of her bodice, fumbling horribly. After what felt to Sirius like the two-thousandth clasp, her robes fell open, revealing she'd been wearing nothing underneath. He couldn't help gasping at the sight.

Terror rising, Sirius looked down at the bed and whispered, "I've...I've never done anything--"

"Shh," said Bellatrix, placing his hands on her breasts. "I'll guide you through it." Tentatively, he rubbed her nipples, worrying them into hard peaks. Bellatrix moaned and Sirius felt himself grow even harder. He leaned down to taste her pale skin and her moaning became more insistent. When he came up for another kiss, Bellatrix pushed him onto his back.

Bella hooked her thumbs along the sides of the underpants that had been restraining his erection. He whined softly when the offending garment was finally removed. Bellatrix wrapped a manicured hand around his member and began stroking him. Panicked, Sirius's head cried, No, no, but he only heard his mouth cry out, "Gods, yes!"

Situating herself between Sirius's thighs, Bella rested on her stomach, mouth hovering over his erection. Sirius's eyes were wide and his breathing shallow. She licked her lips and, involuntarily, so did he. Then, her mouth was on him, warm and wet and sliding up and down and in and out and oh! Sirius couldn't believe this was happening. One minute, he'd been brooding, hating his family and the next he was - no. This wasn't the time and "Oh, yes! Fuck, Bella! Fuck! I'm not going to be able to..."

Bella pulled away, causing Sirius to groan in frustration. She looked straight into his eyes and said, "I want you to come for me, Sirius. Tell me you want to come for me."

"I...I want to come for you."

"I didn't quite believe that."

"Bella, I need to come for you. Please...please," he begged.

"Much better."

Her mouth busied itself once again and Sirius felt the pressure build. When Bella's hand reached up to lightly cup his balls, he no longer could take it. "Ohmygodfuckyesfuckyes!" Sirius came hard, spilling into Bellatrix's mouth. As his breathing steadied, she slowly licked his shaft, making him shudder and shiver.

A minute later, Bella rubbed her index finger along the corner of her mouth and dressed again. "See you downstairs?" Dazed, Sirius could only nod.

Once she was gone, Sirius began packing. He couldn't stay with this family one second longer. Dammit! Dammit, dammit dammit! What the hell have I done?

That night, he ran away. The next morning, the Potters welcomed Sirius with open arms, while Bellatrix sat in the drawing room of 12 Grimmauld Place, leisurely draining a cup of tea. Sirius was gone and his parents were frantic, both blaming the other for the way their white sheep of a son had turned out.

Regulus entered the room, sitting across from Bellatrix, looking nervous, wan and very, very young. A slow smile spread across Bella's face and she moved to sit with him.

Bellatrix placed her hand on his knee and purred, "Regulus, just the person I wanted to see. Tell me all about your life. How's Hogwarts?"

Frantically, Regulus's eyes dropped to the hand on his knee. He then stared at her with wide, pale blue eyes. "F-fine," he stammered.