Lovely, polished prose, and characterization for both of them is brilliant here.
As Flora noted, you do a stunning job with Gellert, showing how a personality that will obviously become dark later on is still charming and appealing, while gently manipulative. And young Albus is just as perfect.
I adore Gellert's voice here. The syntax isn't precisely 19th century, but there's something about it that convinces my ear that he's from another time and place. Which is the truth.