Dangerous
)O(
"You think you're so special…" Bellatrix purred in Narcissa's ear, her voice deceptively soft and tender, sharply juxtaposing the grip she had on her little sister. "For keeping yourself so sweet and pure for your future husband… well, let me tell you, Cissy, you're not so pure."
"I am pure!" Narcissa insisted. She tried to pull out of Bellatrix's grasp. "I'm a virgin!"
"You think that's all it is?" hissed Bellatrix, voice low and dangerous. "Do you really think that having your maidenhead," she spat the word out as though it tasted bad, "intact means you're pure?"
"Mother says–"
"To hell with what mother says. I could corrupt you in a heartbeat, you know. And right now… here… alone with you… I'm very… very tempted to…"
Narcissa's lip trembled and she shrunk away as best she could, her back pressed flat against the wall, though it did her little good. "Bella, you're scaring me."
"Good," Bellatrix purred. "Soon I'll have you crying… screaming for me…"
"Bella, stop it!"
Bellatrix's hand was slowly sliding up Narcissa's thigh. "I love to have you beg me. I want to see you suffer, you know. Come on, sister, beg me…"
Narcissa began to cry, struggling against her sister's grip. "Let me go! Let me go! I'll tell mother!"
"Tell her what?" Bellatrix hissed. "She wouldn't believe you, you know. And… if you do tell her… believe me, things would get very… very ugly for you."
"Stop–"
"Oh, shut up, Cissy!" Bellatrix ordered, and then her lips smashed against Narcissa's. Narcissa's body jolted automatically and she tried to push her away, but Bellatrix was stronger than her, and it took only a few minutes before Narcissa melted against her older sister responding to her kiss.
"I told you I'd corrupt you," Bellatrix whispered.