So Hermione took it on herself to prepare Lucio as best as she could on her own with help from Pansy. For his own sake, she also enrolled him in the nearby elementary school (after securing false identities for each of them along with false documents) so that he could socialize with children his own age and also learn classic Muggle subjects as she’d done as a girl. He thrived there, making friends easily and absorbing knowledge like a sponge. It didn’t bother him that he had to hide his powers and heritage there one bit. He was simply glad to live a normal life and be free from the nursery.