**Chapter 1: A Fateful Night**

David and Daisy had always been like oil and water, complete opposites who couldn't stand each other. Growing up, their parents had constantly played them against each other, making it seem like there was only room for one child to shine. As a result, the siblings had developed a toxic relationship, always competing and bickering. Their arguments were legendary, with both of them saying things they couldn't take back. Their parents had tried to intervene, but it seemed like nothing could mend the gap between them. On this particular night, the tension was palpable. David, 22, and Daisy, 20, were in their parents' house for a family gathering, but they had managed to sneak away to the living room for a private argument. "You're always so perfect, Daisy," David sneered, his eyes rolling. "You always get what you want, and I'm just the screw-up." Daisy scoffed, her voice rising. "You're just jealous because I'm actually achieving something with my life. You're stuck in a dead-end job, and your future is going nowhere." The argument escalated until they were both standing, their faces inches apart, yelling at each other. It was then, in the heat of the moment, that something strange happened. The room seemed to spin, and before they knew it, they were tumbling onto the couch, their bodies entwined. The next thing they knew, they were in David's bedroom, naked and in each other's arms. It was as if they had blacked out and woken up in this compromising position. "Wh-what happened?" Daisy stammered, her eyes wide with shock. David's face was equally bewildered. "I don't know, but...I think I want you." Daisy's protests were drowned out by David's lips crashing onto hers. They began to make out, their bodies responding to each other in ways they never thought possible. As they moved in sync, their initial shock gave way to passion. They kissed, hands roaming, until they finally aligned their bodies and merged into one. Time seemed to stand still as they moved, lost in the sensation of being together. It was only 2.4 minutes, but in that brief moment, they were one. But it was about to get complicated. As David's body tensed, he felt his release approaching. Daisy was writhing beneath him, her eyes locked on his. He didn't realize until it was too late that she wasn't on birth control. The moment his sperm left his body, it was like a jolt of electricity. As it traveled through Daisy's reproductive system, it suddenly realized that the egg it was about to fertilize contained the exact same DNA. The sperm, call it S1, felt a freakish shiver run down its...well, it didn't have a spine, but it was a strange, unexplainable feeling. "Whoa, what's going on?" S1 thought to itself. "This is...this is insane. I'm essentially creating a clone." Meanwhile, David and Daisy were still oblivious, lost in their own worlds. David finally released, his body shuddering as he came inside Daisy. As he pulled out, Daisy's eyes widened in horror. "David, I wasn't on birth control!" David's face paled. "Oh no, oh no, oh no...what have we done?" The room fell silent, except for the unspoken question: what would happen next? And as for S1, it had already done its job, merging with the egg to create a zygote that was essentially a clone of David and Daisy. The fate of this unusual conception hung in the balance, as these two unlikely individuals navigated the uncharted territory of their newfound, incestuous connection.