Nightmare Sans by MoopsArt on Newgrounds

A picture of Nightmare Sans being corrupted after eating an apple from the tree of feelings.

Shopping Mall Nightmare!

megalosomnia — Some old bara sans lewds, full size on Pillowfort

Your best nightmare by ToasterPower777 on Newgrounds

Pov: Nightmare sans decided to sent killer sans a therapist. #fandoms

Neko nightmare sans by chickynuggi on DeviantArt

Nightmare sans(full goop form)

Nightmare Sans Uke Version by RayStewart on DeviantArt

floofi nightmare once again by CloudyFsh on DeviantArt

Art?????? i guess on Tumblr

BunchofDoods — more doodles of noots noots