It has a good basis, although the chapters are a bit too short. As it is, a quick look through for some grammar mistakes and this is good.

Can u pls make the new chapter as soon as possible ? I like this story of yours anyway

5669107 Well I did put a warning up that if this wasn't you sort of thing not to read it.

Confused as to what was going on Twilight tried to speak but found that she couldn't open her mouth do to the pacifier so she just started crying.

Shouldn't this be due?

"Aww, did you have an accident while you slept? "Don't worry, mommy's here to help you."

Since this dialogue is together, do you need the quotation mark there?

"You will be compelled to suck on it untill someone other then yourself pulls it out."

Until has one l.
Also in areas where you have someone talking followed by he/she said or whoever is talking like,

"Don't worry, it's just a small compulsion spell." Celestia said sensing Twilights worrying.

shouldn't this be one sentence with a comma instead of a period rather than two?

5671891 Fixed.

Okay, obvious spelling errors aside, you need to consider the depth of the characters you are describing and how they would actually react to various situations.

"Seeing the only way to find out what it could do, she uncorked it and shrugged as she prepared to take a drink."

So, in this story, Twilight is figuratively a retard? I can't picture someone even considering taking a sip from an unknown potion, let alone drinking one after reading a letter with that kind of warning sign. If the purpose was to study the potion, why would she do that? With that kind of thinking, anyone could have done the same thing. Celestia is her mentor, normally she expects Twilight's analytical mind to come up with a solution preferably through non-oral experimentation.

True, sometimes the only way of really knowing what effects it might have is to actually taste it, but that’s never a firsthand choice!

The need for this tactic is negated in the first place as well, considering it's Princess Celestia we are talking about, last I checked she's an alicorn of overwhelming if not supreme divine powers, but what do I know, maybe she's just a figurehead in your universe.

I'm coming down strong because I want you to consider these points, while it's fine to make grammatical and/or spelling mistakes every once in a while, character depth can seldom be compromised, it makes for an uninteresting story that will be skimmed through and discarded.

5677954 A part of it is explained in the next chapter. It's also supposed to be inferred that the first part of the chapter takes place a night, and twilight being twilight stayed up realy late either reading, studying or both and as you know you make all the best decisions when you do that.