This idea just came into my mind so I decided to do this.
I hope you like it and if you find any mistakes I'm sorry T_T (english is not my first language).
Additional Notes
I know in the original story Theseus is 8/9 years older than Newt, but here let's pretend Theseus is only 2 years older.
In this show the idea is to follow their lives as young adults, watching them go through their first professional experiences and face challenges as they grow up and need to learn how to deal with their own feelings. In parallel, we know about their past when they were students at Hogwarts and how some events still impact their lives. The main point is their bond as brothers and how even with their differences, they always got each other's back.
(p.s.: the gifs are heavy so you might have to wait a bit until they load completely)