I'd be careful about posting anything MLP related on other platforms. While MLP forums is generally a safe space to discuss this including OCs and fanfictions, it's clearly not the same everywhere. I know Dah Onion Eater likes the Rainbow Factory fanfiction, while not my cup of tea, I can respect other people's like for it because we have a thing called freedom of expression.
Why do you think I talk about my MLP fanfic fantasies here on this forum, but not anywhere else outside private discussion? keep in mind my fanfics are not even sexualized. Although I am thinking of making my OC (in adulthood after reincarnation and growing up as a Pegasi in the next life) have a secret crush on Princess Luna in alternate timeline Equestria, that's as far as that would go, even then my imaginary self would be too embarrassed to admit that to her especially if other Ponies caught onto that, and hey, at least it's better than the Rarity X Spike implication in the official show.
Some people may not understand why, but different nature and nurture means different beliefs, interests and values. There are lots of fictions out there that talk about reincarnation, and characters do not always get reborn as the same species they were before. I think stories like that are more interesting however, as they help show that sentient life is to be respected no matter what form they take, and that humans are not the center of everything. If I could choose this reincarnation into Equestria fictional world like in my fanfic, I could not say no, even if I had to give up my human form after that life was over in the afterlife to do it. I want to learn from them, be one of them, contribute to the greater good with those new abilities, that would not change just because I'd become a Pony, to me that'd be a symbol of appreciation for their acceptance, and I don't believe I'm inherently better than anyone else. In a way, fan fictions like this are food for thought about the topic of speciesism.