Roman (boy) and Deceit (girl) have been in love for years. On day, Deceit seduces Roman and the two of them spend a night together. But when Deceit falls pregnant, Roman has a choice;

Leave Deceit and the baby, and remain as a light side.

Or, abandon the light sides and become a Dark Side so that he can look after his family.

( I would prefer to be roman if possible )