Receiver, you make someone's world a better place. Whether with companionship, compassion, cake or comfort, the Receiver provides inspiration, affection or succour to a Bearer wishing to make their gratitude and appreciation known.
You'll do echoes their sentiment with a teasing edge, while
Thank you thanks them for their recognition, and
If only or
Unworthy express their perceived unworthiness of the sentiment. The promised support of
And my axe!, the affectionate devotion of
I'm yours or the slightly smug edge of
My work here is done may also be appropriate.