Regulus smiled even as he chided his brother. "What did we say about my name? It's Regulus."
He reached up and wiped Sirius' tears from his cheek. "We can't go back in time, but we can go forward. This is one secret that you will need to keep for as long as possible." He sighed. "The Aurors know. I had to go to them. I could have reappeared, but I needed them to arrest these people. Sooner or later, someone will slip up and it will come out, but until then, we'll try to keep it quiet."
He snorted. "Stop it. Now, you're making me sound like a Gryffindor. I want to survive. I want our world to survive. I'm happy to let the others do the dirty work when possible. It's why I was in communication with Dumbledore, to let him know. Someone needed the information in case something went wrong and I didn't trust anyone at the Ministry."