Star Wars: The Hidden Shadow

A Sith apprentice – plagued by a strange voice in his head – must regain lost prestige by rescuing one of their own from a Republic prison. When the mission goes awry, resulting in his capture, he must help the Jedi protect a senator wanted dead. But aiding them threatens all he believes in, awakens forgotten memories, and evokes a feelings he's always feared: love.

Also posted on FanFiction & Archive of Our Own.

Mature rating because of language, fairly graphic violence, and stuff.