This is how I believe a Remus a Sirius got together and it does go up until book 7. Which means there is book moments too.
Year 1
James, Sirius and Peter all become 老友记 at the start of term feast. (Well actually just Peter becomes they're friend but 你 get the point.) Remus doesn't befriend them until later that 年 but he is already 老友记 with Lily. When they do become 老友记 Remus is instantly 圣女魔咒 由 Sirius.
Year 2
(Near end of year) James, Sirius and Peter find out about Remus' condition. Which of course we know that they still want to be his friend.
Year 4
Remus stars to develop...