order ?

I'm assuming you're asking reading order, All About My Two Dads // Boku no Papa to Papa no Hanashi is the first story, I’d Like to Write About Love is the spin-off. I'd start with https://www.mangago.me/read-manga/boku_no_papa_to_papa_no_hanashi/ since the characters from I’d Like to Write About Love show up in that story first, it is still ongoing though so just keep that in mind.

Thanks