The Timid Prince's Runt Mage TTPRM

Born prematurely, Merlin's magic is unstable, and incredibly dangerous, but nonetheless strong.
After spending her entire life in a small town with her aunt, she's thrown into a loop when the crown prince himself sends them a letter, wishing to hire her as his personal mage?!
Upon meeting him though, Merlin is even more shocked, when he defies all rumors with a timid personality and soft heart..
Moreover, he keeps confessing to her?!
"I don't want you to be just a mage.."