I' d recommend that you first check that the sims in question aren't related in any way. If their relationship is high enough, I'd check their mood. To find the action, the 'Special' or "Romantic' interaction menus could have what you need.
I'm sorry I couldn't be more helpful as I haven't yet done it myself.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.