Hermione followed Albus' gaze. Of course, Hermione would know that laughter anywhere. Sirius was laughing at something Snape was saying. "Very peculiar" Hermione thought, "I wonder what this brought on?" Her first thought was that someone had spiked some punch or beer, and she suspiciously looked at her drink, but no, that didn't seem right. Perhaps being in a relationship with her nephew just made Sirius more gracious, and if that was the case, perhaps there was hope for her. She decided to approach Sirius.
"Albus dear would you be so kind as to hold my drink for me? I'm going to go try to talk to Sirius."
Hermione breathed deeply and walked over to where Sirius and Snape were talking.