Response to #3903 This is going to be VERY surprising to you, but unless it's a shitty ass therapist, they will actually be pretty chill about a lot, especially fictional content. A therapy session is supposed to be a place where you can freely express yourself, and be in a "judgement free" zone. Unless you're doing something actually and actively harmful to yourself, or a real person in your life, or animals, you can basically not cross the line of action for a therapist, when it comes to just fictional content.
A therapist is there to help you work through issues, and honestly, by those standards, telling them: "I ship these two brothers from my fave anime, fucking each others bumholes." Is probably far down on the list of anything they'll react to.
I mean to put this into perspective, you're looking at "proshipper" content as being some real bad shit, fictional incest/pedo/etc, and it has to be "hidden" through saying "I cope with reading/writing/creating fan-content." Oh no, how horrible, fictional content!
Meanwhile, this doesn't even come close to what a lot of therapist at some point have to deal with, eg: A patient having invasive thoughts, where they want to bash someone's head in, or hurt someone in their mind,strangers, loved ones, for no reason, where their brain forces invasive thoughts of doing actual harm to real life beings. They have to deal with women having PPD or PP-psychosis where they just want to murder their newborn because they can't handle it. They have to deal with people lifer altering trauma, wanting to commit suicide, or revenge fantasies, describing their mindscape in creative detail, and how it makes them feel, and how, why, and when. They have to deal with so much actually damaging stuff, which is doing active harm to the patient, and could become a risk to the people around them, and you're legit here thinking that admitting to liking some fictional nasties is what's going to break them? Really?