What they do when they find out about your magic. 

Merlin-

Merlin gave you a magic book and told you about his magic. He was delighted to have someone else he could speak about this gift with; it was a secret you two would keep to death.

Arthur-
He was mad at first, but then realized how much he loved you. Whenever his father would go on a rampage about magic, Arthur would go and find you. You never did anything wrong, he was only concerned.

Mordred-
Mordred took you to meet the Druids. It had been many years since that particular group had seen a magical non Druid.

Gwaine-
He made sure no one found out and became very protective of you. It felt nice to have someone so protective over you.