Tsuna listened to the flower telling him about the Underground, and he looked about at the tattered rock walls around him. When Flowey mentioned the friendliness pellets, Tsuna lit up in joy. What was having a friend gonna be like? Mama never let him play with the other kids.
His tummy feeling told him that he was gonna have to be careful. The friendliness pellets came out and floated around them. So empty, they felt. Their color had been taken away and they were hurt and sad. Tsuna used finger paint once, and glitter too. His tummy feeling told him he had to do that to the friendliness pellets, so with a careful swoop, his tiny hand took them all.
He was only peripherally aware his hand was tinier. He didn't really think about it much, since he was in a place where nothing was normal and his intuition responded faster than him to compensate.
He imagined little kisses drifting onto the pellets. "Flowey," Tsuna said. "Where did your color go? They're so lonely.." The little kisses drifted away from his color, with his color turning yellower to give them the right glitter color back.
And then the friendliness pellets wiggled, like tiny bugs, before ethereal wings of yellow sprouted from them, flying back to the flower. Butterflies liked flowers, he remembered, and made them healthy, so he grinned as the flower grew up.
The flower grew up to a little boy like him! But fuzzier! And he plopped to his butt, tired. Sharing colors was hard! His color was flickering, but coming back slowly. His eyes lidded, before flaring open in surprise as Not-Flowey pulled him close.
He wasn't quite sure what was happening, but his color was very happy close to his new friends color and he comforted the crying child. "s'ok," he told Not-Flowey. He thought he felt this arm around him happy thing once before a long time. He felt it might have been Papa, but his Papa's other orange color was pinchy on his orange color. But the yellow color felt sort of like home but not quite.
A burst of energy filled him as Not-Flowey smiled tearfully and turned toward the only exit. Tsuna had a moment of fear. What if his Not-Flowey yellow-color friend went away! He took Not-Flowey's hand and asked to come too, and Not-Flowey said okay!
So they got up and started off, and Not-Flowey told him about his Mama, who seemed much nicer than Tsuna's Mama. But he couldn't really keep his eyes on Not-Flowey's face as his intiuition hummed in delight.
And a blue color showed up! A blue color followed by a .. A skeleton! The television said Skeletons were inside people, but this Skeleton was a people! Blue people! And before he could mention a warning to Not-Flowey, they smacked into the boney blue person!