No. Leaving Regulus behind might be the single regret he had about it all. Sirius wished he could have taken him with him. He still wished Regulus would come with him. Just not go back. Why did he have to be the obedient one? He never missed his parents, but he missed the feeling of having a brother. He missed being able to take care of his kid brother, hell, and pranking him by telling him that the sorting ceremony consisted of fighting a dragon.

"Why would she care about my friends? Peter's Peter and Remus is a half-blood. And you can assure her that the Potters can hardly contain themselves from joy." Sirius lowered his voice. "There'd be room for one more." He saw the blush and drew his conclusions with a smirk. "So, who is it? 'not really'. Complicated, huh?"