The Overflowing Bra

TOO = Also
To = indicates a destination is being discussed.
So, a bike trail TO hell, please...
Lacy drifted off TO sleep...
Also, after over an hour of riding, she becomes tired and thirsty... so she takes this side trail that would bring her to a brook that ran parallel to the bike trail... but, she went on that side trail for ABOUT AN HOUR???  Assuming a 10mph pace on a bike (which is slow) that means the "brook" was running parallel to the bike trail 10 miles away!
It's stuff like this that makes a story suck.
Also, what's up with the 2 inch indents on your paragraphs?  And why don't you indent them all?  Either indent a new paragraph, or don't.  "This mix and match shit's gotta go."  (Rocco, from _The Boondock Saints_)
Oh, and this:
"Lacy still fast asleep started to moan softly, than her moaning became, louder and louder. Lacy started to feel some odd pleasure without any knowledge to why? "
That is a statement... just because the character has a question about why something is happening doesn't mean the statement ends in a questionmark.
Anyway... formatting, grammar, and bad story telling... couldn't even get to the sexy parts.

Ladies, Gentlemen, and the nameless cowards, can we keep the feedback constructive, please? If you have an opinion, good or bad, can you please back them with reasoned backing or some educational hints for a novice writer? Some of these posts are embarrassing to read, they are bullying, pure and simple. 

No, there is no quality control. It's post as you see fit. Recruiting a few test readers and proofers is recommended for everyone, but in no way mandatory.
Things to watch out for.
One: Don't post Word documents. They contain all sorts of potentially embarrassing information, Tim.
Two: Basic grammar. Get your hands on a writer's guide and give it a read. Word will catch only the most egregious mistakes and false positives, and then only on a sentence by sentence level. It's hopeless at the paragraph level. Nobody's written a decent and usable English language parser that I'm aware of, so you'll have to teach yourself to do the hard work. To be frank, I'd refuse to even proof this story in its current state because it would take too long.
Three: Passive tone. Too often you write "Lacy was doing something." when you could have written "Lacy did something." This style forces you to better describe the character's activities in an as it happens fashion and lends immediacy to the story. Very handy things to have on your side when trying to maintain reader interest.
Four: Presentation. Use tabs or indents rather than massive numbers of spaces at the beginning of a paragraph. Also don't indent so far. Half an inch should be more than enough. I use a quarter inch.
Resist the urge to use multiple punctuation marks. Doing this!!! makes the writer look like an idiot!!! Doing it in the story title will scare people off before you've even started.
Very visual piece. Keep that up, tune the grammar, and keep writing.

HeliumGirl pretty much summed up my thoughts, the only thing I'd like to tack on is the fact that if they needed her for what happened at the ending, why bother having female trolls?

Oh my God, why would you even submit this as a final version?  Isn't there *any* kind of quality control here?

two baad about that hole spellin grahmher thing, otherwise the story would have just merely sucked

Like Girl said, you had lots of problems Technicaly, and character wise.  The BE was good, but that was the story's only saving grace.    

crud.

I agree with HeliumGirl, it was very hard to read.  Poor punctuation; you need to let it be edited for these mistakes by someone else.

The, extra, use, of, unnecessary, commas, ruined, the, flow, of, the, story. And please learn the difference between "to" and "too".
I didn't like the troll, nor the heroine's abrupt change in attitude. The most positive aspect of this story was that at least some thought was put into the first BE scene, with the nipples growing first and the rest of the breast filling in as a result of suckling.
I'm not trying to be mean here. Actually, I think the basic premise was actually pretty good; the writing shows great potential. You just need to learn a bit more about the technical aspects, avoid rushing through the storyline, and develop your characters a bit more.