Draco hadn't seen much of Scorpius since the party which he felt guilty about. He liked the boy, actually told several how amazing he turned out, but Draco still found it odd to have a grown son running around. Hearing "Dad" when he was 18 was stranger than hearing Weasley and Potter spawns call him "Mr. M" but it was also comforting. Scorpius clearly liked Draco and felt easy around him, something Draco never felt around Lucius. For all those reasons, Draco wanted to try harder with his son. Besides, the protectiveness that rose in him whenever someone mentioned his boy was undeniable.
Most people wouldn't say Draco smiled warmly, but the one that lit his face when he spotted Scorpius was clearly welcoming. Ironically, his nerves disappeared too. Maybe talking to Scorpius so often via journals prepared him. "My son," he teased, "The workaholic." He nodded approvingly before reaching over to squeeze Scorpius' shoulder. Yes, they were the same age, but Draco didn't want any distance between them. Even if they didn't recall anything back in their real time, what if there was a small inkling that remained? He wouldn't risk alienating his child. "Still need to eat though, particularly because I'm starving. Are you at a decent stopping point?"