"I don't know if it makes a difference, but I wasn't killed neither by your friends or mine." Regulus got up and went around to sit next to his brother. "He asked to borrow Kreacher to hide something incredibly valuable, but you know Kreacher. He's never been able to keep anything secret from me, and he told me all about it. It's when I realised what he was doing. I found a way to take it from him, but I didn't have anyone who could help. Your side... well, I didn't exactly trust them, and I couldn't trust my friends. I couldn't trust anyone except for Kreacher. It was the hardest thing I've ever done, Sirius, and-" He stopped, trying to get his voice under control. He hated this so much, but he needed Sirius to understand.
"I needed you to ask, to know that I didn't die while fighting your friends. I died trying... trying to rid this world of him," he said, with a smile.
"He's been a friend. The only friend I've had, Sirius. IF this is what he wants, then it's what I'll do, and I expect you to be nice to him." He smiled. "I'll have to see it when you get this bike of yours."