No cute potatoes, there will be a lot of cringy smut in this. Also, I'm not going back to check often, so mistakes will be made. This may or may not be purposefully cringy and/or filled with plot holes. It's your choice to read, so don't criticize the writing.

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.