This is an au where Ultima and Testarossa end up together and start dating. Upon seeing this Rimuru decided to allow them to go their own seperate way to live together. Ultima and Testarossa now live alone secluded from the chaos of the world in their cozy little home with ofcourse a onsen. thanks to Uchiha Gask for the cover of the book and helping me with the tittle of the story https://www.wattpad.com/user/Uchiha_Gask
13 parts