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Storygraph[1] does this with their Buddy Read feature. My wife and I use it to read books together and leave messages about different happenings, which only get unlocked when you mark that you've read up to that page in the book. It's a great feature, and we really enjoy it.

[1] https://www.thestorygraph.com/

I wish there were discussion websites for media like this. If I've finally watched a tv show, everyone is already talking about another season. I want some sort of "season one insulated forum" or something. For all those that are in the same "temporal" spot.

Not the same thing but if your show has a subreddit, they will probably also have discussion threads for each episode.

Somewhat similar to r/patientgamers - so r/patientreaders, r/patientwatchers, etc.?

That’s a cool idea, thank you for sharing. Yes, I want to tie conversations to specific locations in the text, but I love the idea of being able to set discussion questions as well. Will look into that.