Conversation so far:
What is Tara Maclay's primary role on the show Buffy the Vampire Slayer?
Tara Maclay's primary role throughout the series is that of Willow Rosenberg's partner.

Question: Do they form a relationship?
Self-contained rewrite: Do Tara Maclay and Willow Rosenberg form a relationship on Buffy the Vampire Slayer?