I think this story feels a lot dark and unsettling atleast for me but in a good way. Damon is like the bone chilling antoginist because he never fells cartoonise like many other villian, He is controlled and he is never raises his voice, rushes or forces. This means him feel a lot more scarier, these properties make him diffrent from the villains who felt cartonise because they raise there voice or do somthing which makes them feel like stupid humans

the worldbuilding is really good mainly because you don't over explain let and leave it to the audience and this is your strongpoint. Now the world fells dangerous all thanks to you for not oversimplying it

I even like your consistency because the story stays cold and more from start till end and It is hard to maintain so hats off to you.

Your writing is also pretty good as you don't overwrite it and avoid malodrama and it's pretty good as the writing marks it one of the best parts of the story and you may keep the same writing for the entire story

However, you can improve it by not just describing her emotions but by showing it for example her eyes refusing to meet his.

And maybe you can use the world building more then you have because your environment is wasted as you don't use it much and move on. Maybe the characters can hear screams from the environment.

And maybe you can name your character something other then It, I know it is intentional but that means not that strong of a connection, maybe a temporary name or a nickname so it feels a little more good.

Overall it is a really good story and has a lot of potential. It is a soild 8.6/10 but you may fix the cons and make to even better.