"Are you sure you're okay with this? Adding them back?" Ink asked Error. Error nodded as he gathered the rest of the vials. "How about you? Are you okay with no emotions?" Error asked. Ink looked at him as they made eye contact. He looked away. "I'll be fine. I'll just gather more paint from my AU" Ink replied. Error was feeling insecure. Going to Ink's universe was a nightmare. No laughter, no smiles, no color.
Ink put half of the vials in his bag and Error put the other half in his bag. "I hope their okay" Ink whispered as he looked at a cyan vial. Ink and Error opened separate portals and left the multiverse.
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A while later in Undertale (Pacifist Timeline 18), Frisk and the monsters are having a picnic in the meadow. They were celebrating Sans' birthday. Sans was just lying in a tree. "Sans?" Frisk called. Sans looked down and saw the Ambassador of Monsters and Humans. "Sup kiddo?" he greeted. "Ink is here" she said.
Sans was a little alerted. He was still traumatized by the other timeline (I suggest you watch Underverse because this story supports it). He climbed down form the tree and looked at Frisk. "Are you sure buddy?" Sans asked. "He said he has a gift for you" Frisk replied.
She was aware of what happened. She was concerned of course, but she knows that Ink has changed. "Give him a second chance" Frisk said. He gently touched Sans' cheek and smiled. Sans looked at her golden eyes and sighed in defeat. "You know Sanses don't give second chances, but… I'll give him a go" Sans said, giving Frisk a kiss in the forehead.
Frisk lead Sans to the group. There he saw Ink, making flower crowns with Chara and Asriel. Ink noticed him and smiled. "Happy birthday Sans! I brought a gift for you!"