Sans' 'Ticklish' Predicament

UPDATE I decided to digitalize this pic, mainly for palette reference purposes. :3

I think it was pretty damn obvious that tickle art of Undertale was gonna come from me sooner or later, so here's Annoying Dog enjoying the taste of Sans' ticklish ribcage. X3 Dunno if I should put a Mature Content barrier on this, though, since this is more or less nudity but not really...? XP

(THE RIBS WERE SO FUCKING HARD TO DRAW MAN ;-; )