The Pike4 books in series
The Pike: Ships in the Night Publisher's Summary
The playfully evil sisters, Zoey and Eve, play matchmaker from their bakery, The Pike, in Pike Place Market in Seattle.
Ligaya is a quantum physicist working in a research lab at the University of Washington. She is seduced by the numbers and math with a drive that excludes everything in her life including social interactions. Emotions have always been hard for her to understand or express.
When she meets an ex-firefighter, Allison, she finds herself fighting to understand all the new feelings rising inside. Allison has a primal drive to help and protect people and Ligaya's innocence is like a drug to her.
With the the non-subtle meddling from the women at the Pike, Ligaya and Allison find themselves pulled inexorably to each other.
(The Pike series is set in the same world as Music of the Soul and London Harmony, and can be heard as a standalone book.)