Flowey didn't know what to do, so he resorted to the script. The toddler watched up at him, nodding along to the explanation. The friendliness pellets were shot, as the normal script seemed to allow.
What happened next didn't follow the script. His soul didn't come out in any normal form. His pacifier only glowed, shimmering beautifully, and Tsuna gathered up the friendliness pellets in his hand.
"Flowey," the child said. "Where did your color go? They're so lonely.." And he gathered the pellets up to him chest, the orange glow gradient from the top, fading into yellow. And the yellow trickled away in little sparkles, as the pellets, as they truly were now, each lit up as a sparkle touched them. Each yellow, they seemed misty as they came back to Flowey.
The flower instinctively flinched, but it was a moment of fear that changed, as something he felt long without filled him. Joy! He looked at his paws, up at the little child, and knew. The child somehow gave him a soul. But he feared the child damaged his own.. he was just a baby, so tiny.
And it seemed he was right to fear. He could see the child was drained, and his soul was halved. The child was surely going to perish. He grabbed the child's shoulders.
"Why did you do that?!" Asriel cried, his eyes overflowing, and bundling Tsuna against him.
"s'ok," Tsuna said, patting Asriel's arm. And then something magical happened. Something he never even knew possible. His Soul resonated with the child, singing in Harmony. That empty feeling he could barely acknowledge when he tried to connect to Chara, but with no magic of her own to respond, only a feeling of Wrath inside her, was filled with hope. The hope for the endless Sky he was never able to see. The instinctual craving all monsters had in the depths of their subconscious.
But the young goat monster flinched in remembrance. This was when Mom showed up, right? He turned towards the enterance of the flower bed in the ruins. Something delayed her this time, for whatever reason. But he could see his mom again.
A hand slipped into his and he turned to see Tsuna smiling shyly at him. "Wanna go with you, kay?" Tsuna pleaded with puppy dog eyes bigger than lesser Dog. "Yea!" Asriel said excitedly. "Let's go! Mom'll love you!"
And he started off, babbling excitedly about his Mom's tasty pie as he wiped the tears of joy and sadness from his face, before running into a wall with a familiar face grinning down at him.