"You say that like this should be the easiest thing in the world for me to believe, but you have to remember that you're Regulus Black." He shook his head. "And the last I checked you didn't kiss people who were half-bloods let alone Gryffindors and werewolves."
Sirius snorted. "Yes I'm sure he would." He chuckled when Regulus laughed and shook his head. "Let it never be said that I am not a brilliant problem solver."
"I..." Sirius opened his mouth to respond and stopped to actually think before he did, "It's surprising, the way Remus was telling me before." Because he remembered Remus telling him that he and Regulus had been spending time together. He told me you two only met to talk about Christmas gifts, and then you were still meeting but Christmas was over." He shrugged. "It makes a little more sense now, knowing you two were snogging. And are you trying telling me that if I started telling you I was spending time with Snape, you wouldn't be a little surprised?"
He thought about Regulus' suggestion for the map. "That is possible, I hadn't thought of that. Whatever has been bringing people back is not your ordinary magic, that might be something we have to think about."