In the same crossover MV as the twinkle toes thing.
Since more people are mentioned:

X - OG Cross
Shade - Nootmare the Goopy
Horror - OG Horror. He doesn't need a nickname since DS Horror is canonically called Randy.

"Pardon my French, but you're fucking weird."

X blinked at him.

"Have you looked in the mirror lately?" He asked.

Sketch wasn't sure whether he should be offended by this or respect the immediate return of burn.

"...Fair. But you're still weird."

"Why thank you."

"What are you doing here, anyway?" Sketch asked him. "Shouldn't you be, like, guarding Shade's latest claimed manor or something?"

X shrugged. "Meh. What's there to guard against? Horror's got it covered, anyway. I figured you'd be pretty chill to hang out with, and sometimes it's nice to get away from the chaos."

"Understandable, really."

Sketch popped his knuckles.

They were sitting on the edge of an asteroid in Outertale. Sketch had expected Stitches to be there, but X had shown up instead.

"What are you drawing?" X asked.

Sketch glanced at his sketchbook. Being a part-time assassin, his mental state wasn't the best. Currently, he was working on a pencil-shaded drawing of...well...not something for those with a tender stomach. A particularly nasty image he couldn't get out of his head.

"Probably not something you want to see," he told him, turning it away from him slightly.

X tilted his head to the side. "Now I'm really curious. What do you mean by that?"

Sketch shrugged uncomfortably. "Eh...its pretty gory."

"Have you seen the people I live with?"

He had a point.

"Alright," Sketch relented, "but don't say I didn't warn you."

X eagerly took the drawing. His eyes widened. "Jesus-"

"People tend to say that," Sketch muttered.

"It's really good," X mused. "Could I look at the rest?"

"Uh...sure, I guess...?"

Sketch suddenly felt somewhat nervous. Why did he want to look at all of his drawings? They were weird as frick.

X seemed fascinated by them. After flipping through a few pages, he said flatly, "If you were a freelance artist, you'd be rich."

Sketch gaped at him.

"What-"

"These are great!" X enthused. "And your art style is really cool! Course, not everyone likes horror and gore, but if you could find the right people, and you wanted to-"

Sketch scratched the back of his head. Was he...embarrassed? "They're not that great," he muttered. "It's just a hobby."

"Maybe, but- pardon my French- you're really fucking good."

...Sketch decided that X was cool.