https://www.amazon.com/dp/B08BPDB3PB
Reika's new obsession with meeting and besting Marlin is a test to both her relationship with Fiona and Derrick. Fiona is determined to keep her lover's emotions in check and her mind in a good place as her urges and behavior become unstable and in the mean time puts on weight. Derrick finds out how hard it is to be apart from them both.
This is the 4th of a series.