He had not run, before. Not as hobby, no, and not as a necessity, and not as sport. And even if he had, he realized, it would still be nothing in comparison to this: he'd never felt this alive.
It was not just the scents, which should have been overwhelming in their intensity and number but very much weren't, not when he was able to gather their meaning almost instinctively and unserstand where he was, and what lived there, and while he couldn't recognize them he could understand enough. It wasn't his reflexes, either, letting him run fast and know when to jump and where to land and how to duck and turn. And it wasnt the way he felt tireless, with the promise of even more energy as the Moon rose.
It was all that and more, and the way Peter accepted his challenge and Harry felt himself wanting to compete, and barely holding himself from glaring at his experience, at his comfort. At his strength. And yet, the rivalry did not feel sharp, more playful: He didn't know if it was because Peter was pack, or because he was Peter, and he didn't care to find out. He'd rather run, and enjoy, and let instincts and curiosity take the lead, and it took him a moment to even accept Peter's suggestion, so lost as he was in what he felt.
And then they were close to water, and they stopped, and Harry didn't so much come back to reality as be able to focus on all the differences, and on Peter, and how familiar he smelled in a sea of new discoveries.
What a question, moreover, he'd asked.
"I feel alive." He laughed. "And not at all tired."
Just a little bit breathless, yes, but he'd never been able to do this. He should be passing out from exhaustion by now.
"Is this the Moon, or do you feel like this all the time?" He even asked.
He'd be jealous, if he wasn't experiencing it himself now.