So what I did, I do not recommend, I decided "Oh, I'll just upload it to Tapas for 4 minutes and no one will see it" Not realizing that when you make a comic, it notifies everyone who follows you, haha.
But if I were to do it again, I'd probably just make it's own webpage and throw it onto my hosting service, and then just share the link. There is Google Pages, which I was hoping to make work for this, but you can't just write one in HTML.
Once I saw a comic in itchio that was done in this way. (Gigi of Cucumber quest did this once for scroll format) and I don't know how they set it up, but that may be a good way to make a private page? Not sure how itchio works or (checks itchio) why there's a lot of comics on it for some reason.
Too bad we don't have geocities anymore, right?