Monophobia (I think—that’s the fear of being alone) or leukophobia (fear of white?) with errorink?
((Went with leukophobia! Man, for a soulless being, Ink's got a few more phobias than you would expect))
Two overly bright eyes blinked once. "I'm fine, Ru. Promise."
"...you've been staring at that wall for the past ten minutes without moving."
Oops. Busted. Ink chuckled nervously, still unable to tear his eyes away from the empty wall. "Do… do you think Blue will let me paint it?"
Error rolled his eyes and tugged on Ink's scarf to make the idiot turn around and face him. "Course he will," he grumbled. "...one way or another." He grinned widely- maniacally some might say- and made a tugging motion at one socket.
Ink was easily distracted now that he was no longer staring at the blank white wall. "No!" he scolded. "Error, you can't threaten him! This is supposed to be a good day, they're finally moving to the surface-"
Error laughed and planted a kiss on his cheek. "Shut up, squid. Let's go downstairs, yeah? I'm sure he'll let you paint some walls, he's dumb enough to say yes."
Discomfort still prickled in his bones, but when he glanced back at the massive, empty white wall, it… wasn't quite so bad. His grin was a little more genuine when he looked back at his boyfriend and said, "...yeah, let's go."
"Don't call my friend dumb!"