-Their first kiss is the Christmas after everything happened. They’ve been growing closer and closer for months. Credence makes the first move because Graves is wary of forcing anything on the younger man (Credence has been waiting for Graves for a few weeks and finally takes matters into his own hands).
-They’re married two years later. Graves proposed.
-Newt comes all the way from the jungles of Asia to attend the wedding. He’s Credence’s best man. Tina is Graves’.
-Credence gets a wand, but never really clicks with it. As a result he mostly just does wandless magic (with the added bonus of freaking out all of Graves’ baby aurors - the seasoned aurors know that Credence wouldn’t hurt a fly and like the pastries he brings on the rare occasions he visits Graves at work).
-There’s a magical bookstore not far from their shared apartment that Credence gets a job at. Graves makes enough to support them, but Credence likes reading and is good at knowing what books people need without being told (Queenie thinks she rubbed off on him during the time he lived with her and Tina, but the truth is that Credence has just spent a lot of time people watching).
-Shortly after their fourth anniversary, Graves brings home a little eight-month-old no-maj born. He tells Credence the parents had abandoned her after they caught her making her toys fly, and Credence immediately falls in love with her dark eyes and little baby smile. He transfigures a bottle and fills it with warm milk, seeming to know from instinct how to care for her. Graves had only brought her home for the night, but the next morning Credence tells him in no uncertain terms that the baby is staying. Her name is Marigold, and the adoption is finalized only a few short months later.
-Marigold gets a little brother a few years later. His name is Jonathan.
-Graves never thought that the worst months of his life would lead him to this kind of happiness. Credence never knew this kind of happiness existed. They make it work.
-There are problems, of course: nightmares, flashbacks, problems punishing their children (Credence hates giving out punishments, reasonable as they might be). Graves takes on occlumency with a vigor that exhausts him for over a year until he’s mastered it. Credence still has to cast spells over his husband in the middle of the night sometimes to make sure that it actually is his husband. They both pretend that Marigold leaving to attend Ilvermorny doesn’t terrify them - they both fail.
-But there is more good than bad: Jonathan grows up never hearing Grindelwald’s name spoken in their house; Marigold is sorted into Thunderbird of all things; Credence flourishes under the teachings of his friends and mentors, Graves careful tutelage in Defense Against the Dark Arts, and of course the innumerable books he reads during the quiet hours at the bookstore (which the elderly owner sells to him when she’s ready to retire a few years into his employment); Newt is an excellent uncle to their children, always being some exotic beast to teach them about, and Tina a wonderful aunt; Jonathan takes after Graves at Ilvermorny, but it’s Marigold who becomes the auror and Jonathan who goes into teaching.
-Credence and Graves only retire after a particularly close call, one where Graves almost doesn’t come home. Even then, Graves does consulting and Credence has his bookstore. And when the children or grandchildren or great-grandchildren come over, they have chocolates to spare and chess to teach.