Harry had just been planning on going to the kitchen. He hadn't even heard when Sirius had arrived since he'd been so fascinated with this device, the PDA. Trying out different parts of it. And there might have been an odd nap from staying up late because he'd been way into the device. So he'd missed the arrival and was only heading out of his room for food.
When he left his room and spotted his godfather ... well, hugging Remus .. he sort of froze. Surprisngly enough, there was a very quick three seconds of joy over seeing Sirius. Well and alive, despite what he'd learned. Then there was terrible, horrible awkwardness. For stepping into something so uniquely private, even more so than the hug at the Shack. And well, ... it was his godfather and his former professor and he was soon to be fourteen. There was no way that it would never not be awkward.
"I'll be ... I'll just ... kitchen. Sorry." Harry said before high-tailing right to the kitchen.