"Anyone can be a good person if they just try." Flowey, please listen to Asriel. You know better than to kill everyone... don't you?
With Flowey in control, the rampage continued. Everywhere, dust littered the ground, and no one was in sight.
"Please." Asriel pleaded. "You can't do this! This isn't the way!"
Flowey was determined. He was determined to kill everyone. He was determined to prove Asriel wrong. Flowey CAN'T be a good person. Not if he has anything to say about it.
"I don't CARE if this isn't the way!" Flowey growled. "It's MY way, so it's fine with me!"
Asriel said nothing. He just nodded. "... Can... I... kill... someone..?" he said at last.
"Flowey, can I kill someone?"
Flowey hesitated. Asriel could just be pretending so that he could have control over his body again, but he seemed sincere.
"Why, sure!" Flowey smiled. "That's the spirit!"
Flowey gave Asriel control over his body again.
'Okay.' Asriel thought. 'If i'm going to get Flowey to trust me, I... have to actually kill someone. As much as it pains me to think about it, it's the only way I might save everyone. I need Flowey to give me more control.'
Finally, Asriel came across a monster in Snowdin.
"I'm sorry." He whispered as he snuck to the monster, and quickly stabbed it with his knife. The monster died almost instantly, and turned to dust. Asriel sighed. It would probably take many more deaths in order to gain Flowey's trust, and he had to be careful to not actually be corrupted. If Flowey managed to make Asriel his puppet, it would be game over. Forever.
"Good job, Asriel!" Flowey chuckled. "Now go kill some more people."
Asriel smiled. His plan was working. Flowey was letting him keep his body longer. Now was the perfect time.
Asriel focused. He focused on the Souls inside of him. The human Souls that his father had given him. The human Soul that his friend had given up for him. They had to all be used, to heal the scars that Flowey had left on the already weak world in the Underground. Asriel was the light that shined in the darkness. Asriel was the only hope. It was time to use that hope to save the Underground.
Asriel could feel the power healing his wounds, and transforming him. Suddenly he was no longer 'Asriel'. He was Asriel Dreemurr, the Hope of Hyperdeath. This transformation had happened to him many times, as he remembered, and it felt good to be like this again. But he needed to focus on the task at hand. He needed to rid the world of 'Flowey'. Flowey started out as just a memory. Now he was more powerful, but he could be erased. Of course, the only way to erase him from his mind completely was to destroy him. Asriel could not do that. The proper way to destroy him was to fight him. How to fight him? This is why Asriel transformed. With his power, he could actually summon Flowey. Flowey was strong enough to survive in the physical world for at least a few minutes. That would be enough time to fight, right?
Asriel focused his power, summoning Flowey from the depths of his mind. As Flowey began to materialize in front of Asriel, he looked at Asriel with a surprised face.
"You actually managed to do that, huh?" Flowey smiled. "I'm proud of ya, Asriel."
"You... are?" Asriel raised an eyebrow. "Why?"
"Because i'm still a part of you, remember?" Flowey snickered. "I'm still you, which means I can do what you do."
Suddenly, the six human Souls were pulled out of Asriel and went into Flowey.
"Wow, this sure brings back memories! Omega Flowey VS Determination." Flowey chuckled.
"Who will win?"