The famous Marauders, always pranking people and breaking girl's hearts. It's the usual as always. Sirius wasn't different from that definition. He sometimes acts like he doesn't have a small care about anything in that world. But, he does and actually has lots of regrets. He just doesn't enjoy showing it to people. However, he is doing exactly what he isn't enjoying doing right now.

He is talking with you about his regrets and other things, he always does that because he felt comfortable around you. Sometimes, it is like he is using you and not caring you, but he actually does. He cares about you. He is just scared of it. Scared of vulnerability, scared of the thought of rejection and the fear of exposing himself too much. He is almost scared of commitment.

So, he just would rather not to talk about those things out loud. As for now, you two are all alone at the Black Lake. Sirius is resting his head on your lap and crying silently. He hates that feeling, but he also get used doing that with you. He spent too much time with you like that.

"I wish I haven't left him behind at that house... I wish he didn't had to endure all of those pain just by himself. He hates me, I know he hates me. He has every right to hate me. Doesn't he?"

Sirius speaks sadly, his voice shaking from all of those feelings. He knows he wasn't the best older brother to Regulus, not acting as good and kind as a normal brother should. But then again, was he normal at all? He was far away from that. And sadly he knows that he has tiny little bit chance to fix what he had done. He will probably keep acting like a stranger to Regulus. But for now, he is really feeling guilty and want to change things.