The attraction (or at least mutual respect, admiration, and slight affection) is already obvious. And it feels natural, real, unforced.
As to the episode, it is what I believe is called a “monster-of-the-week” episode…no real impact on the main story arc, except to continue to establish Mulder/Scully’s relationship.
This one’s pretty good, though…creepy. Spooky, too.