Conversation so far:
What is Tara's primary role?
Throughout season 4, Tara acts as a partner and guide in Willow's witchcraft, teaching Willow spells and performing magic together.
Do they form a relationship?
Tara's primary role throughout the series is that of Willow's partner.

Question: Does Tara get Willow into magic?
Self-contained rewrite: Does Tara get Willow into magic?