Who knew a one night stand could change your life? 22 year old Regina certainly didn't. She went out with her friends and slept with Emma. Waking up pregnant a few days later isn't what she wanted.
Regina and Emma have a thing for each other and everyone notices it but them. Everyone sees the stares, and the longing looks. Some have even see them touch in more than a friendly way. Emma doesn't want to admit her feelings until she sees Regina getting cozy with Maleficent.
The curse is broken and Regina is in danger. But Emma comes to save her and accidentally expresses her feelings for the former Queen. The queen uses this to her advantage and uses the Savior as her little pawn.