In order to get Elena to stop bothering Devon to join the academy because he had no intention of going there without his friends, he agreed to be put in a different kind of academy with just one teacher.
To be precise, he just had to agree to Elena becoming his tutor and had to drop by the castle every day for his lessons, it was either that or he was going to be forced to join the academy.
That was very possible now that the king knew about his abilities but because of what happened that night, Nathaniel chose not to do that and gave him the freedom to make a choice.
Devon still wasn't happy with this development but he just had to deal with it since it was better than joining the academy for him.
At least he could still return home and carry out his stealing operations without worrying about anyone tracking his movements, anyone besides Elena that is.