>>11925599I think it was a kink meme fill that really brought the pairing to my attention, but basically I like to think that despite seeming so icy and intimidating, Sabrina is really just a normal girl, albeit perhaps one whoes emotional walls are a little high. Erika, on the other hand, I see as very sociable, warm, and laid back, so a nice foil to Sabrina. Their cities are nearby so I don't think it's a far fetched idea that they might know each other.
I really like the idea that Sabrina went to Erika to help her with her new look, since Erika is known for her eye for beauty and Sabrina may have wanted to seem less frightening with a more casual wardrobe.