Set after Invisible Hand, but before Peace Talks, and during Bonding Allure....
Visiting Chicago, Ranma has something very important to tell little sister about "their" mother, but Dresden is late.
Worried that her sister missed such an important meeting, she calls around for help and finds one of Dresden's other siblings...
Chapter 1 can be read here.
The Return (Blood Debts novella): Our Sister, The Idiot
Chapter 1: Missed Connection
Chapter 2: Roughly Foreplay
Chapter 3: Dominating Climax
Chapter 4: Awkward Afterglow