Against my better judgement, I am keeping secrets for Mordred. I don't trust him as far as I could throw him, though it's true that I've never seen him be anything other than loyal and true to Arthur since he joined us.
But I know better than that.
Because of destiny. And prophesies.
My days are now spent watching Mordred, worrying for Arthur, and second-guessing the actions of both in order to avert a disaster.
So yes, Arthur, I am like a swan. More than you know.
Swans fiercely protect their family when threatened, and are loyal until they die.