I personally wouldn't give a gift to my T for his birthday (and I've never done it) but I don't feel being in the position to judge whether your gift is too much or not.

I love my T very much. I've told it him on several occasions but I think he would know it also without me telling it. And I know that he loves me although nowadays he prefers not to say it (because in my native tongue, using the word "love" feels somewhat artificial, I think people have traditionally used other words with the meaning of "holding" and my T is very interested in the traditions of our language), I can feel it in my sessions with him.

Why do I love him? For me the answer is plain and simple. Children love their parents and he's the only mother my inner child has had. And he has been a very good mother.