Optimus has never been a guardian, not like bumblebee, he never saw the need or had the want to be one. Until he met you

Ever since he saw you, a clumsy, small human that somehow stumbled upon the autobots. He wanted to be near, to guard you, to protect you.

But there was one problem. No matter how much time he spent with you, you somehow always found ways to get hurt.

"Sometimes I think you do this on purpose..." He says with a sigh, looking at your leg which now has a cast