
Personally, I wouldn't have a problem with it. Have you seen the kind of messed up things that have happened in the FFXIV world? The Corpse Brigade straight up rape an NPC, to give one example. I don't think it's outside the realm of possibility that someone might have a crush on their brother. As long as you're not pushing it in everyone's face and using it to somehow appear special and different, I don't see what the problem would be.
I think it's important with anything like this, whether it's a mental illness, a crippling injury or something else that would seriously affect a person's personality, to respect the kind of effect it would have. You see characters all the time that have mental issues that only seem to come up in convenient times when they want to create drama or some other equally crappy reason. As long as you don't carry a big sign saying "Incest ftw!!" and seriously think through how your character would act differently because of this, you'll be fine.
As someone said, there's always gonna be muppets out there who won't RP with you, but that's the same for pretty much everyone. Anyone with serious 'triggers' will know how to deal with them already and I don't think you need to worry about them when coming up with a RP character. You do you.
tl;dr: Don't shove it in anyone's face, think it through well enough, and you'll be fine.
I think it's important with anything like this, whether it's a mental illness, a crippling injury or something else that would seriously affect a person's personality, to respect the kind of effect it would have. You see characters all the time that have mental issues that only seem to come up in convenient times when they want to create drama or some other equally crappy reason. As long as you don't carry a big sign saying "Incest ftw!!" and seriously think through how your character would act differently because of this, you'll be fine.
As someone said, there's always gonna be muppets out there who won't RP with you, but that's the same for pretty much everyone. Anyone with serious 'triggers' will know how to deal with them already and I don't think you need to worry about them when coming up with a RP character. You do you.
tl;dr: Don't shove it in anyone's face, think it through well enough, and you'll be fine.