Wren could almost always answer a smile with a sunny if lopsided one of his own, and he did so as the stranger smiled at him. He was easily lulled into a sense of security if the person doing it was kind and kept smiling, unable to see through a fake or dark smile even with his augmented vision.
"Oh, I'm Wren!" he exclaimed back, pleased to have a name as though Jeremiah had given him a present of some kind. "Heart is a pretty name for a dog." he commented next, his attention back on the chocolate not-lab and her move forward, making him giggle without restraint as she came back to investigate him. "No, I love her!" he promised, enthused about both his new friends.
He nodded that Jeremiah was right, that the ground was cold, distracted a little with Heart's attention on him.
He looked up with a beaming smile when he was offered a drink, reaching to pet the dog before standing up on legs made wobbly by the cold ground. "Oh, thank you very much, yes please Jeremiah." he accepted, although it wasn't certain that Wren should really be given any caffeine. For his part he'd only had coffee when one of the kinder guards had slipped him some and it had always made him jittery, his heart skipping around the way he did when he made a friend. "Then later the ground will be warmer and I can get worms." he advised, trying and failing to clean his filthy hands off against his legs.