As requested, I'm leaving my review. I'm not an English major or a Beta, I simply love to read a good story and provide my thoughts as a reader.  So here you go...

I'll give the negatives first:

"her mind stopped working and fear overtook her every pore." I would use 'neuron' instead of 'pore'. As though fear overtook every impulse conducting cell of her brain because that is how she would have to react in her position; on impulse.

"She was like a mad woman, biting and scratching. She was a mad woman."  I might change this and use a synonym of mad in second sentence: like crazed or incensed. I've seen a lot of reviews where people comment that you should not use the same words twice.

I also had a small problem with the following lines:
‘You saved me.’

‘What?’

‘You saved me…thank you.’

‘You saved me too. We saved each other.’

I would possibly change Hermione's last line to something like.
"You're... welcome," she hesitantly responded, not quite sure how to react to Malfoy's uncharacteristic or newfound affability. "It was the least I could do... after you helped me."
But to keep using the work "saved" is again repetative. 

"She returned the embrace and both o f them grimaced in pain."   You have a space between the o and f in the work of.

"I didn’t kill Dumbledore that night in our sixth year but I have done bad things, terrible things."  I didn't care for the use of the word "bad".  I might redo this as "I didn't kill Dumbledore that night in our sixth year, but I've done...some things, terrible things."   To me, I think Draco would have a hard time admitting what he has done.  When rewritten like this I see a bit of hesitance or uncertainty in admitting it.

"She looked into the eyes of swirling mercury" I might change this to "his eyes" or "those eyes"

'Because I had to prove that I was worthy.'  I might re-write as "Because, I had to prove that I was... worthy."  I'm thinking this way sounds more hesitant on Draco's part. He is about to admit something personal in regards to his feelings for Hermione. 

You can take these suggestions and chuck them if you don't agree. Again, these are just my opinions as a reader ;)

Now onto the positive:  You are a very descriptive writer and I enjoyed reading this One Shot.  I can definately see you expanding on this, either prior or after this scene.

I could actually see the scenes in the tunnel and the shack and could sense the fear, discomfort and emotions of the characters in my mind.

And who doesn't LOVE a good love scene.  I've read quite a few on this site and yours is tastefully done. I need to go back and re-write mine to mirror your style ;)  Some might criticize the whole "looked into each others eyes, ripped their clothes off and made passionate love to each other" structure.
I don't have a problem with it when done properly.  I think you captured it quite well. When characters are in certain situations, such as life and death, they will grab the bull by the horns and go for it.  As humans, we tend to think that everyone lives by a certain morality. I'm sure though, when behind closed doors, when you just know it's right, the gloves come off (or should I say clothes) and the passion is ignited. I think the best line to describe the feelings he had at that moment was " Springing from the ground with a new found energy he was in front of her in two strides. Grasping the back of her neck he brought their mouths crashing together..."  For me, it was like a wonderful scene in a movie. 

Again, you are a wonderful writer and I will look for more of your stories.

Whoa! Did you pack a lot into THAT little story! And LOADS of lemons at the end!

Honey hush! You mad this old broad blush!

HE!HE!HE!

Really liked it and the possibilities ( read plot bunnies ) that sprang out of those twists and turns were wonderful!

I'm going to go check and see what else you've written!

Bravo!