Ooh! Great list! Epistolary is one of mine too! I LOVE letters and texts and even social media-type communications! The Guernsey Literary and Potato Peel Pie Society was a recent favorite, 100% epistolary and really delightful.

I'm working on a historical novel now whose main character is asexual and doesn't know what that is (because...1820s) but he develops a strong love relationship with someone and they have to kind of negotiate the intimacy part. It's been challenging.

Thanks for sharing your Id List!