The Upsilon Andromedae series is a historical sweet romance/sci-fi sober mashup. Books in this series are published in a serial format on this website until half-way through the book. My definition of "sweet" is no sex on screen, some adult situations, swear words are invented, and violence is not detailed.
Book Description:
In the year 1345 after colonization of the planet Samh, the Count of Anorraq has yet to find a wife and have a child to take his position. The planet is three-years deep in a war with neighboring planet, Xiepvu, and the Sultan of Upsilon Andromedae has been applied to in order to end the war—but has not responded to the Samhis’ pleas for help. After the Count is seriously injured, a widowed mother of two, Juliabella, nurses him back to health and for the first time the confirmed bachelor is head over heals in love. Will the two ever be able to come together as war and other difficulties constantly interrupt their relationship?