Link knew how to read, once. He knows this, just like he knows some fragmented things about his past. But, strangely, he'd forgotten by the time he woke up. Link's brand of amnesia took a lot of things from him. People, books, abilities. Endurance, too, but Spirit Orbs, however, could be used to up his endurance if he traded them to Hylia, so they didn't really count. ... He oughta go back to Hyrule someday, just to find some more shrines. Training worked, but it was lots slower.
Right. Reading. He can't read. The words don't mean anything to him. He knows the letters, but he just ... he can't translate them. It's frustrating, and there's nowhere to start learning.
Link, by nature, is nosy and curious. He doesn't just leave people alone when he sees them doing something -- he has to approach until he gets some kind of answer. A shoo, an explanation, a quest for Shiekah to log. (he hasn't gotten any quests since he arrived here, it's kinda weird). Hence, when he sees Orpheus reading, of course he approaches. There's a little spring to his step, and, without preamble, or even shame, he shoves his face past Orpheus' to peer at the book. Except he can't read. He forgot about that. He blinks somewhat disorientedly at the book once it registers, the slight ache of his head, the quick-footed reminders of words gone before they can register. As quickly as he came, he withdraws and shakes out his head, as though that'll loosen the grip of the strange feelings. He recovers quickly enough, luckily. The canine chirps softly, trying his best to convey his curiousity about what Orpheus is reading. Luckily, that's probably the first question somebody would ask here, so he doesn't try anything more in his attempt to question.