After Luna had officially cut out Discord from her and her daughter's life, she felt alone. Abandoned, betrayed, and lied to.

Tempest originally grieved over the Storm King's death, but... she felt more free than ever. She was also left alone with a child, and having to cope by herself.

Then their paths crossed, while Twilight was giving Tempest a tour of the castle. They had a lot in common, and they let each other grieve and vent to each other. They found comfort in one other, and they soon solidified their commitment with engagement rings.

Sonata doesn't like Tempest. She's very suspicious of her, she just wants to make sure her mother won't be hurt again.