Sirius wanted to protect his godson at all costs. He just didn't expect for Harry to turn into a girl and for it to change the nature of their relationship. (Fem!Harry) (Not-So-Sane!Sirius) (Sirius/Harry)
Sirius once lived as a Gryffindor. Now it's time for him to experience Slytherin. (Slytherin! Sirius) (Time-travel)
Sirius finally realised of how much he had lost himself the moment he started considering the idea of not joining Dumbledore's Order. (SiriusLily)
He had to stop this. If not, he would develop a rather creepy obsession with that girl. (Cedric/Hermione)