Sister and I both been aware within the haunted shuttered room
This first sentence confuses me. What does it mean for them to be aware within a room? Are you simply trying to establish that these characters are in this room?
and those trio monitors had a gleam-like best friends
This could use more description. Where are the monitors? What are they for? On the flip side, it doesn't seem as if they're too important (at least not right now). If that's the case, then you don't want to give too many details. It would be a waste to go in-depth on something that would never really serve a purpose.
"Let's murder those ambulant thugs" I said
What the hell is she talking about, and what does it have to do with anything? Is this an excerpt from a larger story you've written?
You go jogging yourself replaceable low life
Again, what the hell is she talking about? I definitely get the feeling that there's some history between these two, but details are scarce. It's not too much of a problem if you're going to dive more into it later on or you already have in an earlier scene. But this scene just by itself is very confusing.
You go jogging yourself replaceable low life..." Chanted her most darling voice
'Chanted' should be lowercase.
But the sudden catch
I'm not entirely sure what you mean here.
forcing my expression towards the lovely masterpiece of her face.
This description would be more powerful if you were to mention some aspect or aspects of her face that the narrator finds attractive rather than simply saying 'lovely masterpiece of her face.'
Why don't we just go to hell right now
I'm not familiar with this phrase.
I get the feeling English isn't your primary language. Some of the sentences are missing certain words, and there are other grammatical issues as well that make this difficult to read to for me.
It's hard to make a cool description of a single action, don't ever spend so much words on one action. Seriously, don't or it'll make you look stupid.
The trick is putting in just enough details and letting readers fill in the blanks. Not enough and readers will be confused. Too much, and it'll feel like you're trying to hold the reader's hand.
If you don't have a lot of experience writing fiction, I think you should focus less on trying to make your descriptions cool. Rather, you should simply try to make them serviceable.
Keep in mind that you can always go back and edit later. Try not to let yourself get caught up thinking about how to craft specific sentences on a first draft.