That is the real reason someone develops a Futa fetish, the exact same thing happened to me while I was growing up and it turned me into a futa-lover, turbo-degenerate for 10 years (since I was 12 years old). Funnily enough, Futa on Male was my "favorite" fetish just like Synth, but I've been free of that stupid shit for 4 years now.
It all comes from being bullied, rejected, mocked, by guys and girls, both treating you like an outcast, that'll make you feel
inadequate, that you're not enough because you're seeing how others succeed in things that you can't (guys getting their first girlfriend for example) and then, the unrestricted access to porn comes, porn being an outlet for your frustrations (socially and sexually), it always start with vanilla shit, but the issue is that, most of the time, porn will turn into an addiction (even easier if you're growing up with the hormones messing up with your brain), and when you're dealing with the stress of being bullied and shunned out by your peers, then it will morph into this thing that takes your insecurities to turn them into a fetish.
>Synth has unrestricted access to porn in his developmental years
>Synth gets bullied and shunned out by girls and guys of his age
>Synth feels that he's "not a man enough" likes his peers
>Synth's porn addiction keeps getting worse and worse, he begins to feel like he failed at being a man, sees himself as a subhuman thing that deserves to be ostracized and "punished", the trauma and the shame that comes from it begins to creep into his sexuality
>He begins to self-insert into the submissive role in porn, he REALLY likes women and not men, so of course the woman has to assume the dominant role in his porn
>He begins watching BDSM, but porn is an addiction, BDSM suddenly isn't enough for him to get his fix, eventually his Futa on Male fetish is born
>All of this because confronting reality is far too painful for him, and he has no reason to improve himself because he perceives that society rejected him, so he goes full blackpilled doomer mode
This is why he always wants to assume the submissive role, to
let go and be free, the first time he talked about Futa, he said that he wanted Abby's (a roided woman from The Last of Us) Futa-Cock up his ass, he mentioned how much he wanted BDSM in Kirsche's stream yesterday, Synth always views himself as the
receiver/bottom/beta because, in his mind, he failed to be the
giver/top/alpha, that's pretty much it. Of course you can fix all of this shit with Nofap but Synth thinks that it is bullshit, and if you mention how you self-improved, he may ban you because God forbids that you have a positive outlook in life and you're trying to help him, giving him advice of how to get out of his situation (unless you're Kirsche).