To what end? What's the clinical value of this information? Finding out why some people are attracted to furries, large set people or blondes isn't going to improve healthcare, technology, the environment or anything else. Hell it won't even improve therapy outcomes. Somethings just are and they don't need a reason. Looking for answers where they aren't needed likely speaks to either a poor coping mechanism to irrational information or in this context an adherence to antiquated models of psychology. There's a reason that good psychologists have moved on from Freudian dream interpretation, because it wasn't providing any value to patients much like this line of exploration. That diverts effort away from actual productive or enjoyable endeavors.
Even ignoring that, this forum isn't an appropriate venue to explore the deep psychological intricacies of personalized sexual arousal. There's no control, it's too specific of a sample and the motivations you're looking for are largely too obscure to meaningfully communicate. What one person says might be the opposite of what another feels.
You mentioned looking at NTR fans. There's plenty of easily explainable attractions to NTR. It could be an arousal from the debasement and corruption of the heroine, it could be arousal from the cheating, it could be arousal from the feelings of loss, it could be a feeling of power by closely identifying with the villain, it could be cuckold angst from identifying with the victim. All real and existing reasons to like NTR but if all you hear from on this forum is from people who get off on the power from identifying with the villain then you're going to get the wrong idea of why NTR arouses people. That problem is going to be many times magnified when exploring arousal to something that's so much more obscure as a furry fetish. Even if a few people were able to explain it you wouldn't be able to make any reasonable inferences to the general population who can't explain it.