Actually, I have a question myself, I can't even get the option to say that I want to make her my wife, the only one that appears is the option to enslave her, which I don't want, I can't recall all the choices that I made up until this point, but generally speaking they have been along the lines of sympathetic and or nice.
Viewing post in Convincing Princess Help
Can concur, I also did not get one for a futa MC, I ended up having to go into my save file with an editor and change my MC gender to male to trigger the flag allowing me to select the option and then changed it back afterwards. I am not 100% myself on this since I don't entirely know coding, but I think the futa gender might be flagged as female at some point in the code as I have noticed that during sex with women with out the bisexual trait they will complain about the character being female, but males without the trait won't make any mention of it themselves.