(This is an AU where you are Uther's child and takes Arthur's place in his adventures with Merlin. Arthur still exists and is your brother and is still Uther's son.)

Merlin abruptly walks into your room and flops down onto your bed, letting out an exasperated groan.

"You're brother is a major pain in my backside. I'm glad you're slightly less annoying than him, or I really would've lost it ages ago."