While there was quite a lot of movement going on in the hall at the moment, it was Cas's wave that caught Sirius's eye. Cas and Lily. Well, if James, Remus, and Peter were going to skip out, he'd just have to have fun without them! Plus, James would probably get that look on his face if Sirius told him that he had taken Lily to the ball. Sure, it wasn't true, but exaggerating things was always fun! Grinning at them for afar, he grabbed a handful of chocolate before heading over to to them. Popping a piece in as he went, he gave them both his most charming smile and a bit of a curt bow once he got close enough. "Dorcas! Evans!" he greeted happily, eating another piece of chocolate as he wrapped an arm around Lily and leaned on her just a bit. Being that they were actually friends now, he felt it was his right. Lily had been terribly mean to them years prior! Which he would inform her if she tried to shrug him off.
"So, have either of you seen my wayward best mates? The lot of them! No idea where they went. If they're off doing something fun without me, we're just going to have to boycott them, Lils. What do you say? Dorcas! You too."