Yuri was almost fed to the abyss... quite painfully
That's not the way to get the attention from the MC, not especially when he's saved your life & the life of your people... Not by confining him, abusing his only family just to try to secure your status in the hierarchy.
Try from square one kiddo. Do the one thing that Princesses/concubines/queens/empresses in all the other stories always lament being unable to do.. Pursue a relationship from the ground up and let him become intrigued naturally.
Or again, get fed to the abyss...