Underpants Sans (Google it) - Drawception
Here's what happened when 12 random people took turns drawing and describing, starting with the prompt "Underpants Sans (Google it)".
Frisk will never stop being determined. - Drawception
Sans In A Bra - Drawception
Underpants Sans warns SANESS not to have a BAD TOM by Abbysek on DeviantArt
Underfell sans X Underswap Papyrus - Drawception
SANS FROM UNDERPANTS (undertale parody) - Drawception
Finally Mail!! : r/Undertale
Pixilart - UNDERPANTS SANS *with eye by MrLFG
UnderPants (DETERMINATION) Sans By ~ PootStablook by PootStablook on DeviantArt
UNDERTALE UNDERPANTS Fangame
SANESSS by Fortnermations on DeviantArt
Underpants SANESSS pranks on Undertale Sans in Apr by Abbysek on DeviantArt
Underpants - Sans and Gaster point at Frisk by Abbysek on DeviantArt