I personally think Ian loved Ken as he would for family, not a romantic type of love. I believe he turned into a thrall to stay with Ken like he promised since he hated vampires who killed his parents I don't see why he would turn into a thrall other than for Ken. I STILL HATE AGIA FOR HIM KILLING IAN I KNOW HE HAS LIKE A WHOLE BACKSTORY AND ALL BUT HE IS HURTING KEN. 

