My nerdy Fish (Underswap Undyne x Reader)

When Y/N L/N fell into the underground, they'd expected to get killed on sight, well that Temmie they met surely almost proved the exception. On the whole however, most the people they met were either polite, funny, lazy, or just batshit fecking crazy. There was one monster in particular though, one that they loved. Undyne, the royal scientist, the nerdy goofy fish girl never failed to make them feel welcome and like their company was enjoyed, and they quickly fell for her.