After reading some of the replies here, I’ll give my two cents on this:
If you want to include incest, go for it.
If you think it makes sense for your story, and feel it would be awkward if it was only implied, then go ahead. I don’t think you should be judged because you include sensitive topics in your story.
Because here’s the kicker: People don’t necessarily support all of what they write into their stories.
All FE games deal with Murder in some way. Doesn’t mean the devs at Intelligent Systems are murderers. A lot of Kaga’s games have scenes where a young damsel gets captured by enemies who plan on doing you-know-what to them. Doesn’t mean Kaga is on a watchlist. Or even a more relatable experience: Some FE games have depictions of racism. Doesn’t mean the writters are racist.
So I say: Go nuts! If you wanna add incest to your story, and you think it makes sense, then you should do it.
And I would also consider the general advice others have given. Like don’t make an overly explicit scene, be tasteful about it, etc… But most importanly: Don’t let anyone stop you from telling the story YOU wanna tell.
Sensitive topics or not, what most impacts the success of a story is not necessarily the contents, but the execution. If you study up on some writting tips and principals, you write almost any you want
