"Reg!" Harry went ahead and threw his arms around his friend, giving him a quick hug with his head pressed into the middle of Regulus' chest. Seeing Seamus had made Harry expansive about his feelings, and he felt safe enough greeting this friend with more than the usual claps on the back. "I've been waiting for drinks. It's beginning to feel like a desert in here, I'm so thirsty."
He gave Regulus a once-over, and grinned at his choice of costume. Flashing back to his youth and the terribly cheesy programmes that Dudley used to love, he briefly thought There can be only one at the sight of Regulus Black showing off his excellent legs in a full kilt. "How have things been going?"
One of his many visits to Azoth House had given Harry the basics about Regulus' new relationship, but they hadn't had a chance to speak of it in detail. If Regulus even would discuss it further; he'd never been with anyone since Harry had known him well, so this was new ground for both of them.