My T and I used to do the same thing!! I used to feel badly about it and refused. When he offered it made me super anxious. At some point I realized he was saying that it was ok for me to ask for what I want or need. It's ok to let someone take care of you. Then I started saying yes, but I try to offer to pay every other time if I could. I couldn't when I was unemployed, so I just accepted the coffee with thanks.