An Angel and Devil

I’ve always wondered,
Can someone be both
An Angel and Devil?
I know someone who’s an angel,
He certainly doesn’t look like one,
He’s a kin
Who teaches me a violin,
He helps me at least a dozen times a day
And even taught me to solve a Rubix Cube.

I know someone who’s a devil,
He really does look like one sometimes to me,
He gets on my nerves,
Annoys me until I get angry,
Gives me the nastiest stink eye.
He even kicked me out of a Google Doc.

I know someone who’s both an angel and devil.
He changes all the time.
Sometimes he’s in a good mood
And makes us both laugh.
Sometimes he’s just a devil
With a dreadful personality
Who is rude and abusive.

When he’s a devil,
He raises his voice,
He glares at me,
Makes himself the wolf
And creates me into a deer.

When he’s an angel,
He shares things with me,
We build things together,
And makes me think,
I have the best brother.