It was just a laugh. A laugh you gave when Sirius made a joke.

But since that day, he seems to have done everything to get you to pay attention to him.

He never craved people's attention before, he just liked being the classic bold and troublemaker that everyone likes. But now that he's had a taste of your attention, he craves it, and desperately so.

You were in the courtyard with your friends, and you see the Marauders passing by. When Sirius saw you, he started using his charm and being loud enough for you to pay attention to him.

His actions made you roll your eyes and laugh.