Ink!Sans x Error!Sans. All you need to know. Also a little US! Sans x UF! Sans. Also at several times I will make absolutely no sense whatsoever...so yeah fair warning.
I have read this story five times it just gets sweeter every time
Papyrus IS way to overprotective. If papyrus keeps doing that, Sans will have a harder time on his own because Papyrus is always protecting him. He won't gain independence. He's brace, though. That's good.