**Chapter 12: Unleashing the Beast**

I slowly got out of bed, my heart still racing from the sudden interruption. I walked over to the window and pulled back the curtain, and there he was, standing in the moonlight, his eyes fixed on me. I could see the intensity in his gaze, the hunger in his eyes. "Seth," I whispered again, my voice barely audible. He didn't respond, but instead, he simply pushed open the window and climbed in. I stepped back, my body still sensitive from my earlier encounter. He moved towards me, his eyes never leaving mine, and I could feel the air between us charged with electricity. "You like to play with yourself, don't you?" he asked, his voice low and husky. "You like to touch yourself, to make yourself come." I nodded, my body responding to his words. I was already wet, already aroused. "Get on the bed," he ordered, his voice commanding. I obeyed, getting back on the bed and lying down. He followed me, his body covering mine. He pinned my wrists above my head, his fingers wrapping around them like a vice. "You're mine," he growled, his breath hot against my skin. "You're my little slut." I moaned, my body responding to his words. He leaned down, his lips brushing against my ear. "Say it," he whispered. "Say you're my slut." "I'm your slut, Daddy," I moaned, my voice barely audible. He let out a low laugh, his body shaking with amusement. And then, he started to move, his body thrusting against mine. He was hard, so hard, and he plunged into me with a single, swift motion. I cried out, my body shocked by the sudden invasion. But he didn't stop, didn't give me a chance to adjust. He just kept moving, his body pounding against mine. "You're so tight," he groaned, his voice filled with pleasure. "You're so fucking tight." I moaned, my body responding to his words. He slapped my ass, hard, and I cried out. "Take it, slut," he growled. "Take my cock." I took it, my body accepting his thrusts. He moved hard and fast, his body slamming against mine. I was a rag doll, helpless beneath him. "Come for me," he ordered, his voice commanding. "Come for Daddy." I tried, my body straining towards release. But he didn't let me come, not yet. He kept moving, kept thrusting, until I was a moaning, whimpering mess. And then, he slapped my ass again, hard. "You're going to come," he growled. "You're going to come so hard." I did, my body shuddering with release. But he didn't stop, didn't let me catch my breath. He kept moving, kept thrusting, until I was crying out again, my body responding to his demands. This was just the beginning. He moved for what felt like hours, his body pounding against mine. I lost count of how many times I came, how many times he made me moan. But I knew it was a lot, a lot of rounds. Finally, we were done. He lay on top of me, his body shaking with exhaustion. I was shaking too, my body trembling with aftershocks. As we lay there, I saw the light outside, the sun starting to rise. I knew it was over, that we had finally finished. And as we slowly disentangled ourselves, I knew that I would never be the same again. He had unleashed a beast in me, a beast that would never be tamed. We lay there, panting, our bodies still shaking with release. And then, he spoke, his voice low and husky. "Get up, slut," he growled. "We're not done yet." But I couldn't, not yet. I was too exhausted, too spent. I just lay there, my body trembling with aftershocks, as he looked at me with a triumphant smile. He had won, and I had lost. But I knew that I would never be the same again. He had changed me, had unleashed a part of me that I never knew existed. And as I lay there, shaking with exhaustion, I knew that I would never be able to go back to the way things were before. He had changed me, had made me his. And I knew that I would never be free again.