[ The reaction is also one that pleases him, but definitely not in the same way as Matt's earnest enthusiasm. It's a rather funny thing about Sebastian. As ancient and well-travelled as he is, where he could reasonably take a much more distant and detached view of the world and interacting with it... He also just loves to be praised. It's not said, naturally, but the way Matt's eyes shine means it doesn't need to be. He takes it as praise for his skill all the same. ]

Why, naturally. I had promised you a gift, and I am not the sort to go back on my word.

[ He says it playfully, since there's also a bit of a joke there that's only for him in this context. ]

Granted, I had offered it in exchange for lessons, which I would very much still enjoy, but I had not quite understood exactly what it was I would be conscripted into at the time, naturally. So if you are not opposed, rather than an exchange, consider it a gift to begin a more regular working relationship. It may be somewhat presumptuous of me, but I imagine we will be speaking often.