Here He said as he put down your order on the table, it was a plate of mitarashi dango.

Let me pay for it this time you said as you started searching for your money, but then he spoke. No, it's on me. I've already paid. He spoke and sat down in front of you to eat.

This was a common thing he did. Since he didn't know how to express his gratitude towards you and how happy he is for having you as his best friend, he always expressed himself with gifts, or with paying anything for you.