>>2399149I'm not sure if fanfic is appropriate in the OC thread, but okay.
I had a look at it. Honestly, I have a hard time reading pairings I'm not into, so I kind of skimmed. It looks like your writing is really damn good actually. If this was a pairing I read then I would definitely read it all the way through, since it doesn't have any of the common issues that most fics have. So I think you're good there. Your problem getting feedback is probably entirely the content, and the fandom.
It's really extreme, and it's surprising that you feel like it's mild. Maybe read some of the popular fics in your pairing to see what people are typically into. There are a lot of people (like me) who like to read fucked up fic but who will never ever admit it, so getting comments and critique would be understandably difficult when people are kind of afraid to post on it. In this era of Tumblr and TWs and etc, stuff like rape/dubcon, watersports, asphyxiation, and all the other gross/dangerous/"bad" kinks aren't considered as "acceptable" and so they're pretty uncommon.
I wouldn't suggest toning down your content, since it's fanshit and you should make what you wanna make, but I might suggest restricting your stories to maybe 1 or 2 fucked up kinks per, instead of a whole load. I notice people will be a bit more lenient on weird kinks in normie fandoms when they're presented like "That watersports fic", like an intro to the kink.
I also mentioned the fandom because, Free is sort of a "clean" fandom, where there's no fucked up stuff in the canon, so it's less likely to be accepted in fanworks. For example, if you wrote this fic about a horror game, you'd probably be seeing more engagement, because the fans are already into fucked up shit. I'm not really making a suggestion here, because if Sousuke/Rin is your thing then you shouldn't have to pack up and leave because the fandom is vanilla, but maybe seeing that POV helps you feel a bit better about the lack of engagement.