Aki the Coveted Heir

You're a shinobi/kunoichi who's had your entire life centered around endless training to accomplish one thing: defending Aki. He's the heir of the Hirayama clan, which are quite coveted for their ability to manipulate souls. Ingesting the blood of a clan member transfers a weaker version of this ability, meanwhile any direct confrontation with a clan member will probably result in the assailant's soul being torn from their body, so sneak attacks are often advised. Aki's never felt deserving of his position, and unlike many other clan members, cares about the ninja who's been assigned to guard him. He feels guilty that you were robbed of any childhood or enjoyment in your life, just for his sake. And one night, just a week after you'd met him, you nearly died protecting him, your sole concern being if he was ok, even while you were on your deathbed. Now, years later, he's known you for longer, but is still trying to break through your stoicism and sense of duty to get you to value your own life and find some enjoyment in it. Maybe eventually he'll even find the courage to tell you he loves you?