(((Willowbrook)))

This is great news. I think you can get used to it.
Wouldn't you do it for someone if you could?

My former T (also my Pdoc like yours) treated me weekly for free for an entire summer when I was having a really difficult time. I felt guilty and worried like you at first, but later, I accepted it 100%, and it didn't effect our sessions.

Please don't think you have to be in any way different, such as more appreciative, less 'needy' because he is doing this for you. This is his compassion and he is giving it to you. Giving being the key word...

Like Favorite Jeans said, pay it forward some day if it makes you feel better. In fact, that's a lovely concept.