I realize that this isn't grounded in canon at all, it's just a dumb fan thing that I like, but I lowkey like the idea that Papyrus and Sans aren't actually related but found each other at some point before the game and became blood brothers or something and then showed up in Snowdin. Everyone assumes that they're genetically siblings and they don't correct them.
Honestly I can see this headcanon working perfectly well.
When I first joined the fandom, I briefly went over this idea to see if I liked it, but in the end I felt I preferred them as blood relatives (so to speak) However! Since I could even sit down and CONSIDER this as a possibility and tried to see how I felt about it should tell you how I see this headcanon XD Perfectly doable as a headcanon, even if I prefer the blood siblings thing more.
(However if people have this headcanon just to justify shipping them then just…. 8′D )










