Before.
It all started one rainy night in London, when Harry decided to introduce his two drinking buddies (Seamus and Dean) to the wonders that a Muggle club could offer them. Both Seamus and Harry were single and Dean, who was fucking Ginny Weasley but had not yet owned it to Harry, played along with the facade and accompanied them, at a loss for yet another excuse. Harry knew about Dean and Ginny of course, but made an active decision to not be pissed off about it and kill Dean.
Harry simply did not give a shit anymore.
The enormous potential that the Muggle world held for Harry was unending. No one knew who he was and, within the context of a post-university subculture, Harry became very successful in fulfilling the casual asshole role. He would go out to the bar, become increasingly intoxicated, meet a young woman, and have wonderfully casual sex with her. Morning would come and Harry would slip away, rousing his hungover partner with the sound of his Disapparation. Harry left no name, no way of contacting him, and he adored it.
Seamus thought that he was brilliant and Dean thought that he was despicable, but again - Harry did not care about Dean's opinions on his life. Ron and Hermione - now, they were a different story entirely. Hermione's tight lipped, pinched frown grated on Harry's nerves and Ron simply shook his head and said, "You've changed, mate." Don't worry - Harry was well aware.
And so, the trio stood together, collected at a bar. Harry and Seamus happily chased shot after shot back while Dean disapproved, thinking about Ginny and hating the current scene in which he found himself. And then suddenly -
"Jesus, is that Luna?"
Harry spun, looking, and saw her. She was wrapped up in the hazy glow of the club, surrounded by the beat of the music, spinning and dancing and laughing. Seamus barked out a laugh.
"Good eye, Dean. Christ Jesus al-fucking-mighty. Do mine eyes deceive me? She looks hot," he commented and then turned, attention span spent and off to somewhere else. Dean stared and so did Harry, unsure of what he felt. Shock, surely, that a witch was deep within the Muggle world… and surprise. Because Seamus was correct - she was hot - and had she been any other nameless girl, Harry could have found himself pursuing her for the night. And then, yes, there it was - lust. It uncurled in his belly and Harry was simultaneously horrified that he felt that towards her, and yet entranced because she looked extraordinary.
"Yeah," Harry said stupidly, after a beat, and became aware that Dean's eyes were resting on him.
"No, man," Dean said sternly and Harry glanced towards him. "Not her. You can't be serious. It's Luna."
"Looney fucking Lovegood," Seamus said loudly, laughing.
Harry glanced back at her.