THIS BOOK IS IN AO3 I'LL LEAVE THE USERNAME AND LINK IN THE COMMENTS
Author: green_feelings
Finished: yes
Smut: yes
Description:
For their 18th birthday, every person receives a letter that reads a simple date. That is the date you'll meet your soulmate.
Harry and Louis have different beliefs, live in different worlds and have different dreams, hopes and fears. Yet, they're not so different from each other when it comes to love. When their paths cross, there is no doubt they belong together. Except for that one, essential difference: they didn't receive the same date.
Or, a fic about differences that make no difference at all: Harry and Louis are soulmates. In every way possible. Featuring Niall as a role model, and Liam and Zayn as a different kind of role models.
Notes:
i've always loved the soulmate trope. this one was really good and i liked how they used it on their plot