I found these chapters in my files, so – going to post!
There is basically a jump in what I have written, I never wrote the in-between ones. So, basically, Serena broke up with Sirius because she got an anonymous note saying that if she didn't, he would die. She didn't pay much attention but then Regalus Black convinced her it was real. (Remus overheard.)
Serena broke up with Sirius. Felicity died, making her think that she was justified – and if Al had broken up with Felicity, like she did with Sirius, then Felicity would still be alive.
After they broke up, Serena walked in on Sirius having sex with some random girl and that convinced her that it was really over, that he wasn't harboring some secret love for her still or anything.
And now…
