I guess it all began at Diagon Alley, in the summer before my sixth year at Hogwarts.
The story travels back to Claudia's Hogwarts years.

His face was so close to mine I could feel his breath on my cheek. “Alright, Siri,” I replied quietly. He smiled. Unfortunately, at this very moment, not only had Dorcas come skipping back down the stairs, calling for Sirius, but Gideon had stepped through the portrait hole. Talk about timing. I mean really. This sort of thing only happens in movies.

“Emily, that’s enough,” I said and she smiled satisfied.
“Good day,” She said, walking away.“Remus she doesn’t understand.” “Oh yeah, I think she understands more than you give her credit for, Claudia,” Said Sirius, looking menacingly at where his daughter had just walked off. I rested my elbows on the counter and put my head in my hands.“I want to help,” Said Sirius after what seemed and eternity.

“Sirius you bloody snogged me, and I’m sure that it would have gone further than that if Gideon hadn’t come down, and then you almost kill my boyfriend and he breaks up with me! And you decided to top it off with getting back together with your little girlfriend! I don’t want to talk to you Sirius, understand now? ” 

“More?” He whispered as a question.
 
“More,” I whispered in confirmation. Our lips met and the kiss got deeper and deeper. Nobody walked in on us, nobody stopped us. I pushed him off of me.“Sirius how do I know everything isn’t going to be the same later? Are you still going to be a jerk? And what about Dorcas and Gideon?” “Just kiss me, Clod.” 

“It’s just as much your fault as it is mine,” Sirius said calmly, and ran his hand down my arm and linked his fingers through mine. I looked at our clasped hands and bit my lip.