Incarnate (Nameless #1.8)

Seventeen years ago, a one-night stand between Erin and Seth led to an accidental pregnancy, which led to partnership, then to love, then to marriage, then to family. Through all of that, their lives have never gotten less complicated. Now their daughters are teenagers, and they have to adjust to a new stage of life.

Incarnate is a slice-of-life novella that is best read after the preceding books about Erin and Seth--Nameless and Christening.