Harry and Draco
Harry had forgotten how long the train ride was. Some time after Ginny had left to meet up with the important folk up front, he got up to stretch his legs. In reality, it was partially an excuse to try to track down Draco. He didn't want to be obvious about it. He just wanted to spot him. If he was in a car full of Slytherins Harry wouldn't intrude. They'd vaguely mutually agreed that they were going to keep it quiet for a while, just for their own comfort, and he thought that was still a good plan.
He poked his head out into the corridor, and the trolley lady was just coming towards him. He bought a couple of blood pops because he'd seen Malfoy eating one once, and stashed them in his jacket pocket. Didn't hurt to be prepared. After she'd passed, he slipped out into the corridor and started strolling, glancing from the passing scenery on one side, to the occupants of each car on the other. He got the occasional wave and the occasional sneer.
Finally, on the far end, shortly before the open cars, he spotted him. And he was alone. It was a bit like a fishbowl in there, but he couldn't help himself. He tapped on the door, then pulled it open and stepped inside, letting the door slide shut behind him.
"Hullo," he said quietly. Well, that sounded stellar. He hadn't thought anything out ahead of time, and spontaneity seemed to desert him.