My Sister's Best Friend, My Lover.

Vol.2 Chapter 7
Vol.2 Chapter 6
Vol.2 Chapter 8
Vol.2 Chapter 6
Vol.2 Chapter 8
Sena is a novelist who has been dealing with romantic feelings for her sister, Yuuna. Upon learning that Yuuna is to be married, Yuuna's best friend and former lover Kiku asks Sena to be her lover...