Now that "barrier" can be somehow used for healing(?!) it won't be a stretch anymore to see it used in more direct offensive ways outside of reflect damage. He could probably make weapon-shaped barriers and projectiles, for example. Or coat ordinary weapons and projectiles with shaped barriers to grant incredible strength and stopping power to it. Though I'm not sure how to feel about that incredible leap in logic with barrier magic somehow used for healing, and no explanation at all for it.
I like that these two had literal piles of food in their hands immediately on page 1. After the expected sequence of him proving his identity, boy was Amelia quick to change her tune when she finally realized she picked up some celebrity ex-court mage as her tutor. Silly girl, that image change won't work when she already exposed her true face to him from the start.
This manga doesn't take itself seriously as much as other power fantasies do, and that's a good sign.
So I suppose next chapter will be the next group of fellow humans who'll try to use him for their own ends? Could be the end of his tutor life here and they'll return to adventuring, but maybe Amelia, who did a quick 180 and is infatuated now will follow him.