Yixing is Luhan's knight in shining armour.

He's the one who puts him to sleep. The one that piggy rides him when he's too tire to walk. The one that keeps him warm, and safe. He's the one who's too nice and lets his princess do anything he wants. 

But just because he's the knight in shining armour, that doesn't mean he's his princess' prince.

Idea to inspire fellow authors. :)