It's in the kilt.
UT fanart - Papyrus, Sans and ??? Smiles in the Shadows
GASTER THO | sans, papyrus, gaster, gaster blasters
"Oh darling, I'm not mad!" "Oh. Well then--" "I'MFUCKINGLIVIDWHOTHEFUCKDOTHESEPEOPLETHINKTHEYAREFSDFIHADAAKLDHAKLHDKLAHFDABFFHALDALKSHDKLAD!!!!!!"
underswap, sans, papyrus, frisk, undyne, alphys, muffet
undertale, frisk, sans, metryingtohelpmybrowithhishomework
San's true attack
papyrus, sans, undertale, pun, funny
Sans and Papyrus ||| Undertale Fan Art by qtgumdropprince on Tumblr