(On Hold) The Guard Who Stole His Heart (Prince! Elias x Guard! Reader)

(Y/N) (L/N) was the childhood friend of the youngest son of the Goldstein family, Prince Elias Goldstein. They were known to be inseparable and troublemakers. One day, however, (Y/N) disappears and is never heard of again. Until one fateful day. When attempts to murder the Goldstein family start occurring more frequently, the Goldstein family are forced to double their guards and hire personal guards for each one of them. But these guards aren't just any old guards, they are the most skillful guards who graduated in their class and (Y/N) just happens to be one of them. What will happen when (Y/N) is chosen to be Elias' personal guard? Will their childhood friendship remain or will it be replaced to just a master and guard status? Or will it turn into something more?
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"Do you, (Y/N) (L/N), promise to protect me from all evil no matter what?", Elias asked as he stared down at me from his throne next to his father and mother. I got down on one knee before grabbing my sword and cutting my hand, letting my blood slowly drip down my sword. I then made my hand into a fist and put it on my chest where my heart should be as I stared right into his strict yet gentle purple eyes.

"With my blood on this sword, I promise to protect you from all danger even if it means sacrificing my own life to save yours. I will fight to the bitter end to make sure you're safe. Until my last dying breath, I will remain by your side."