A/N I would like to thank everyone for the lovely reviews and I've tried my best to incorporate most of your tips into this story. I am planning on writing several chapters for this one. Please review (constructive criticism only please!) as it makes so happy :D.
WARNING: This story contains blackcest! Dirty Blackcest! Don't like, don't read.
Narcissa sat on a large green armchair in one of the library's of Malfoy Manor. She wasn't reading, she was actually listening out for the sound of footsteps approaching so she could prepare herself for the meeting she had organised. After 15 minutes of waiting in silence, Narcissa decided that she had obviously been stood up and as she rose from the chair she dropped the book in her hand. As she turned around and bent down she heard a whistle from behind her.
"Wow Cissy, You always did have a great arse." Purred the voice of Bellatrix Lestrange.
Narcissa gasped and spun round.
"Bella! You… You came!"
Bellatrix Lestrange strode into the room wearing a long black dress and a corset that pushed her cleavage up making Narcissa's eyes widen. When Bellatrix reached Narcissa she pulled her into a hug.
"I've missed you Cissy" Bellatrix whispered into Narcissa's ear, her lips almost touching it. Narcissa shuddered.
"I've missed you too Bella. I…I wanted to talk to you about something." Narcissa mumbled through the tears now pouring down her face.
Bellatrix pulled away from the hug to look into Narcissa's eyes. Bellatrix stroked Narcissa's face and slowly leaned in to kiss her cheek. As Bellatrix's lips touched her cheek, Narcissa felt an electric sensation pulse through her body and Bellatrix felt her sister stiffen.
"I see you haven't changed much sweetheart." Bellatrix purred.
Narcissa couldn't help herself. She felt the desire pulsing through her body. She grabbed Bellatrix's face and forced her lips onto her sister's. Bellatrix's eyes widened for a second before she quickly shut them and pulled her sister closer.
After about 6 seconds Narcissa released her sister panting as though she'd just run a mile. "I-I'm sorry Bella..." she blushed in shame as Bellatrix smirked and grabbed a handful of her sister's hair.
"Come here baby." Bellatrix pulled Narcissa close again and kissed her passionately. Narcissa felt her sister's tongue run across her lips and she opened her mouth so Bellatrix could push her tongue in and massage Narcissa's. Narcissa moaned as Bellatrix bit her bottom lip, drawing blood.
"Fuck me Bella, Fuck me." Narcissa moaned as Bellatrix's hands caressed her breasts. Bellatrix didn't need much encouragement. Narcissa felt herself being pushed onto the armchair and her arms being pinned onto the arms of the chair and Bellatrix passionately kissed her again.
Bellatrix straddled her sister and grabbed a handful of her hair and pulled, hard. Narcissa's scream of pain echoed throughout the library as Bellatrix got more turned on by the second.
"You're mine Cissy. Not Lucius'. Not the Dark Lord's. Mine." Bellatrix growled while her lips touched her sisters. Narcissa nodded slowly.
"Say it Cissy. Say that you're mine. SAY IT!" Bellatrix snarled at her sister, pulling hard on her hair again.
"I'm yours Bella… Always." Narcissa managed to whimper through the pain. She moaned in pleasure as Bellatrix's hands hitched up her skirt and began to rub her slit.
"Oh, fuck yes! Bella, take me. Please. Take me." Narcissa groaned. This pushed Bellatrix on to fuck her sister harder. Narcissa gasped as her sister's fingers entered her.
"Bella... By Merlin! Oh Oh Oh! Fuck, Bella!" Narcissa screamed as the world became hazy through her pleasure. Bellatrix fucked her sister harder and harder until her sister screamed in ecstasy and came all over Bellatrix's hand.
"I-I love you Bella!" Narcissa panted through her orgasm.
"Shh Cissy… Quiet now my dear." Bella whispered into Narcissa' ear as she held her sister up through her waves of pleasure. Narcissa whimpered as her body fell limp as she lost consciousness.
When she opened her eyes again she felt her face being flourished in kisses as her sister lay over her.
"How long Bella?" She whispered.
"About 20 minutes Cissy. I'm sorry but the Dark Lord is calling me. I must go to him." Bellatrix whispered back as she buried her head in her sister's neck. Narcissa looked into her sister's glorious eyes and nodded.
"I understand sweetheart. Go to him. It doesn't do to keep the Dark Lord waiting." Narcissa said her voice stronger than before. Bellatrix nodded again, tears now running down her face.
"I'll love you forever Cissy, remember that." Bellatrix whispered as she pulled her sister into a goodbye kiss. Narcissa's face was now covered with tears as well.
"I'll love you until I die Bella. I'll see you soon my darling." Narcissa mumbled through her sobs.
Bellatrix stood up as strode towards the door. She turned back just before the door and smiled at her sister winking.
"Don't miss me too much Cissy. I'll be back." With that Bellatrix swept out the door and Narcissa heard the pop of her disapparating.
Narcissa collapsed onto the chair and cried. She cried because of her sister. She cried because of her husband. She cried because she didn't understand what she was feeling. She rose from the chair and called out.
"Minda! Minda!" A small house elf popped into the room.
"Yes Mistress Malfoy?" the elf squeaked.
"Burn this chair. I never want to see it again" And with that Narcissa strode out of the room. No-one was to ever know about that night. Or so Narcissa thought.