The Birthday Boy + Sirius Black
Tony had been making the rounds, he'd had a couple dances, had a couple glasses of champagne and was really enjoying himself, for all that he'd felt a little left out initially in the planning he'd know that just having a part at all would pull him out of his funk - that and a little bit of bubbly it seemed.
He laughed when Sirius stopped in front of him to declare that it was his birthday, "Ha!" He laughed, "You're right, it is!" Because it was true, and if someone wanted to tell him that he was happy to hear it and agree with them.
"Sirius, right?" He double checked because he'd been here a while and he knew a lot of the people who were here even if he hadn't spent much time talking to them, "You having a good time?" He asked, because Tony might not have planned the party, but he wanted people to have a good time there, at his party, and if he could be a part of making that happen then so much the better.