Tying my tail in knots

You're the ultimate -- the living end
You're everything I'm not
And ever since I picked you out,
I let you call the shots

You tease me, and beguile me,
Entice me, and delight me,
Lure me into your secret lair,
Coax away my silly fears

And then you smile, and drift away
You'll save it for some other day,
You leave me laughing, go your way,
Tying my tail in knots