I think there might be some confusion here!
You can play Tailor Tales completely, from beginning to end, with both passionate and innocent endings unlocked. Nothing is being blocked or withheld from you, for example I'm not blocking the 'best' ending with a premium version.
Tailor Tales Plus simply has a longer epilogue. The normal one has the same epilogue, but it cuts off at a certain point. TT+ picks up where the normal one left and that's where the adult content starts. The differences are easily stated on the Patreon page, my blog, and even here :)
Tailor Tales Plus will also contains side stories, though these have not yet been added, but they will in the future!
If you pledge on Patron to get early access (remember, you're getting early access, which means whatever is available that month. You do not get continuous updates unless you continue to pledge each month) to Plus, Dimitri's and Neil's route are fully unlocked for you, not to mention you don't have to pay for chapters, nor pass any dressing requirements. Caine's route will have to be unlocked by simply playing through it as your main route, though you still don't have to pay anything for chapter or pass requirements. However, it is a different save file, you will have to start from scratch, so to speak. Itch.io doesn't support DLC :(
On that note, I have a question - do the kind or fierce choices lead to dialogue changes before the ending?
No. The fierce/kind only changes the current scene a little bit (you can check it out by quick saving before each choice so you can see what's different). Sometimes it changes the entire scene, sometimes it changes only the next few sentences. Eventually these choices tally up and will determine which ending you get, which are definitely different from each other.
Which is to say, you already got the ending! Chapters 26 & 27 are the end, while chapter 28 is the epilogue. You stopped at chapter 28, so you're just waiting for the epilogue. Again, to explain, you're still getting the same ending, except the normal one has a shorter epilogue while the Plus version has a longer epilogue because it contains the adult content.