Give it a SHOT (Underswap Fontcest)

Underswap Sans x Papyrus EXTREME NSFW! (I do not own any pictures including the cover photo)

Sans gets curious as to why Papyrus comes home drunk all the time, so he talks Papyrus into letting him try his whiskey. After waaaayy too many drinks, Papyrus manages to pry Sans away from Muffet's and back home to where Sans lets himself go. Having drank so much alcohol and for his first time makes him confused, vulnerable, and curious. Papyrus doesn't have as many shots, but he's still affected and has his own alcohol-induced fun time. After that one night stand with his brother, Papyrus realizes he's craving Sans' body and eventually can't control himself anymore.

Again, this is NSFW, please be responsible and respectful.