The Billionaire’s Last Mistress

The night was soaked in rain. Water hammered the pavement, flooded gutters, and turned every car that passed into a wave of headlights and steam. Isla Rose ducked into a narrow alley behind the bakery, hugging herself against the cold. Her clothes were damp, her canvas shoes squelched with each step, and her hands trembled as she tapped a message into her phone. Where are you? Please. Just answer me. Aiden hadn’t replied to a single text all day. His phone rang once, then straight to voicemail. Again. She gritted her teeth and started walking toward the bus stop, the city’s glow blurred by rain on her glasses. She hadn’t even locked up the bakery properly—just threw the keys into her apron and left. Every gut instinct screamed something was wrong. This wasn’t just another hangover. Or another missing wallet. Or another promise from her brother that ended in nothing but debt collectors and broken windows. The phone vibrated in her pocket. Blocked Number. Her breath hitched. She hesitated, heart thudding, then answered. “Hello?” The voice was low. Male. Velvet-smooth, with a razor edge. “Isla Rose?” She blinked, stepping under the awning of a closed bookstore. “Who is this?” “You have ten seconds to get into the black car parked behind you. Or your brother dies tonight.” Her spine snapped straight. “What—?” “Ten. Nine. Eight…” She turned sharply. At the edge of the rain-washed street sat a long, black limousine. Windows tinted. Engine silent. No one else around. “Seven. Six. Five…” “I swear if you’ve touched him—” “Four. Three…” Isla ran. The limo door opened before she reached it. Inside was warm, scented faintly with leather and something darker—clove or musk, she couldn’t place it. A man sat across from her, dressed in a black suit, bald, with emotionless eyes. He didn’t speak. The door slammed shut. The car moved before she’d even fully sat down. “Where’s Aiden?” she snapped. He didn’t answer. Just reached beside him, pulled out a slim black tablet, and handed it to her. On the screen: Aiden. Tied to a chair, lip split, blood streaked down his face. His head lolled to the side, but he was breathing. Conscious. “Oh my God,” she whispered. “Aiden—what did you—?” The video cut to black. “What do you want from me?” she demanded. The man finally spoke. “You’ve been summoned.” “Summoned?” she echoed. “By who?” Silence. She stared at him, stunned. “I’m not going anywhere until you tell me who you people are—what you want—what the hell is going on!” “You’re already going,” he said simply, and turned his head to the window. She tried the door. Locked. No handles. Panic clawed up her throat, but she forced it down. Screaming would do nothing. Not in this world. Not when whoever had taken her brother clearly had more power than she’d ever imagined existed. They drove for over an hour. The city lights faded, replaced by rolling hills and private estates hidden behind tall, iron gates. At some point, the pavement ended and gravel crunched under the tires. Then the car turned onto a long driveway lined with dark trees, towering and sharp like teeth. At the end of the drive stood a mansion—gray stone, arched windows glowing faintly, roof crowned with iron railings. It looked like a fortress. The gates opened without anyone touching them. Isla’s pulse stuttered. Lightning flashed—and for a brief, blinding moment, she saw a figure on the highest balcony. A man in a black coat. Watching her. The car stopped beneath a stone awning. A butler—stiff, impassive—opened her door and held out a black umbrella. She stepped out into the storm. Inside, the house was silent. Marble floors stretched endlessly, lit by golden chandeliers. Oil paintings stared down at her from the walls—somber men, distant women. None smiled. The air smelled like old money and secrets. She was led through a long corridor, then up a staircase that spiraled like a snake. “Where are we going?” she asked. No response. At the top of the stairs, the butler knocked once on a tall oak door. A voice answered from within. “Send her in.” Her heart slammed once against her ribs. Then the door creaked open. The room was vast—bookcases, a fireplace, dark wood floors. But none of it mattered. Because at the center, seated behind a polished mahogany desk, was the man who had spoken. And he was the most terrifyingly composed person she had ever seen. Black suit. No tie. Shirt unbuttoned just enough to show a hint of collarbone. His hair was dark, perfectly styled. He didn’t rise as she entered. Didn’t offer his name. Just stared at her with eyes the color of winter steel. Her mouth dried. “You’re late, Isla,” he said. Her fingers curled into fists. “You kidnapped my brother. I didn’t come here to play word games. Who are you, and what the hell do you want?” The corner of his mouth twitched. Not a smile. Something sharper. “My name is Sebastian Wolfe.” The name hit like a slap. Everyone knew it. Billionaire. Reclusive. Infamous. The man who had turned his family’s ancient shipping empire into a global titan of weapons and defense. The kind of man who appeared in financial magazines without ever stepping into the public eye. A ghost. A myth. A monster in a suit. “I—” She swallowed. “Why me?” Sebastian rose slowly. He was tall. Broad-shouldered. Built like a man who never once had to lift a finger but knew exactly how to destroy someone who tried him. He circled the desk, moving toward her. She held her ground, barely. “Your brother,” he said, “owes the kind of money that gets people killed.” “I know.” “No, Isla. You don’t.” He reached into his jacket, pulled out a folded photo, and handed it to her. It showed Aiden playing cards. Another man across the table, face blurred—but his hand held a ring. The ring bore a wolf’s head. The symbol of the Bratva. “Russian mafia,” Sebastian said. “Your brother thought he was gambling with rich college kids. He wasn’t.” Her knees went weak. “Aiden has forty-eight hours before that debt is called in,” Sebastian said. “Unless I pay it. And I’m willing to do that.” She stared at him. “Why?” “Because I have a proposition for you.” Her stomach twisted. “What kind of proposition?” His gaze was unreadable. “Be my mistress.” Silence. The room seemed to shrink around her. “I—I don’t understand.” “It’s not complicated,” he said. “Live here. Accompany me. Obey me. For six months. No questions, no secrets, no lies. At the end, you walk away with enough money to buy your brother’s safety—and your own.” Isla took a step back. “Is this a joke?” His tone remained flat. “Do I look like I joke?” “You want me to—sleep with you?” “I want you to be mine,” he said simply. “In every way that matters. I want you here. Under this roof. Under my rules.” She stared at him, horrified. “Why me?” His expression didn’t change. Then he said, “Because you look exactly like my dead wife.” The words sucked the breath from her lungs. She stumbled back. “What—?” “Two years ago, my wife vanished. Officially, she drowned. But her body was never found.” He walked toward a fireplace and lifted a silver-framed photo. A woman. Elegant. Pale. With Isla’s eyes. “I’ve spent the last year watching every camera in every city that mattered. And then I found you.” “You’re insane,” she whispered. “No,” he said. “I’m in pain. And I’m rich enough to do something about it.” “You’re sick.” “You’re desperate,” he countered. “Your brother is dead unless I pay. You have no savings. No job, as of now. And no one coming to help you.” She turned, hand on the doorknob. “If you walk out now,” he said softly, “Aiden dies by morning.” She froze. “Don’t pretend you didn’t know how deep he was,” Sebastian said. “He’s been spiraling for years. You’ve protected him. Covered for him. Loved him more than he ever deserved.” She closed her eyes. “I’m offering you a way to save him. And yourself.” “And all I have to do is sell myself to a billionaire with a dead wife and a God complex,” she muttered. He came to stand behind her. Not touching. But his presence filled every inch of space. “Call it whatever you like,” he said. “But the offer stands until midnight.” They gave her a room. It wasn’t a bedroom—it was a suite. White silk sheets. A bathroom the size of her entire apartment. Wardrobes full of clothes already in her size. She stared at it all like it was a trap. Because it was. She sat on the edge of the bed, hands in her lap, heart racing. Outside, thunder cracked. Then a knock. She opened the door. A different man stood there. Blonde, lean, younger. His face wore a mocking smile. “I’m Julian,” he said. “Sebastian’s brother.” She didn’t answer. He leaned against the doorframe. “He picked you because you look like her, you know. But you’re not her. You’re smaller. Softer. Easier to break.” Isla backed away. “Is that a threat?” He smirked. “Just a reminder. People don’t survive in this house unless they know when to shut up and obey.” Then he winked and left. Alone again, she walked to the mirror. The girl staring back at her looked pale. Fragile. But her eyes weren’t just scared. They were angry. She didn’t know who Sebastian Wolfe truly was. She didn’t know why his dead wife mattered. She didn’t know why every cell in her body felt like it had just stepped into something bigger than her entire life. But she knew one thing. She was going to survive this. Even if it killed her.