Ordered two glasses of draft beer!

Ordered two glasses of draft beer!

Delighted!

Thank you for waiting. Here's your draft beer!

Thank you for waiting. Here's your draft beer!

Hey, Shino-san, fork over the 3,000 yen I loaned you the other day.

You know, you always dodge like that, but oh well.

Then this is your treat. I'll eat and drink my fill!

Oh, a glass of draft beer, please!

Why can't you say a feeling of gratitude to your senior who's been so good to you? For example, "this is my treat."