>>3076914Flamers are only a concern if your account is doxxable or if your content is against (or in a gray area with regards to) the platforms' ToS.
For the first point, don't link any identifying information with the account(s) related to the game.
For the second point, you may or may not have a hard time. A 17-year-old in ecchi hijinx is very tame, and as long as you don't mention minors outside of the game, you'll probably be fine even if you're technically breaking ToS. But you might not be, especially if you have enough haters reporting the game (which I doubt you would).
Steam, Patreon, and Itch would be a bit of a gamble. SubscribeStar and Unifans io are totally safe for this though—their ToS are extremely permissive and one can get a lot more taboo than what you're describing.
And if you're worried about the emotional distress of being flamed—I don't know, don't be. I've posted FAR more degenerate stories to Ao3 and received plenty of hatemail. Just block, delete, or laugh it off. If they don't know who you are, the absolute worst they can do is report you and maybe get your account/game taken down. (And let's be real, even if they do figure out who you are, doxxing is often just a scare tactic with little to no real consequence, and you can probably get them in just as much trouble because doxxing is almost certainly breaking ToS, if not the law.)