It's super irritating to be knocked back to the end of his junior year after he already graduated and was halfway through summer vacation back home. It's even more irritating to have to convince the school (that he doesn't even want to go to, but will definitely hunt him down if he doesn't show up) to let him move up to the junior year randomly because he happened to age two years in one Confluence. But he'd've been even more bored learning stuff that he largely already learned, so.

New classes. New classmates, not that he ever tried too hard to be friends with anyone here beyond Nico, Dylan, and a few others. For now, he's got a free period and is using it to camp out in the library and study some of the concepts in his classes that differ from what he's being taught back home (trying to transfer mid-semester between universes isn't easy, even for him, all right). He could use a study buddy, maybe. Or a distraction. Or maybe someone noticing that That One Fifteen-Year-Old is seventeen now.