Power Exchange?

I thought that I had given you
This power over me
But now I realize with rue
You took it easily.

I don’t know how it was you knew
You needed only ask,
And I’d surrender up to you
The right to set me tasks.

Since then I’ve found I love to serve,
And your approval crave,
And finishing this learning curve
I’ve asked to be your slave.

Mistress I find I can’t request
My power back; you know the rest