Spike.
The dragon among the ponies.
Twilight and her friends know, that he would do anything to help them.
What they don't know, is just how much he is already doing for them. And for Equestria.
This story takes place before and during episode "Look Before You Sleep" from season 1.
Contains violence and sexual themes.
Original idea of a story with Spike as a 'secret protector' from Lokimen, thanks man. ;)
Once again big thanks to my friends irky3 and Kic for proofreading and sharing their thought on this fic.
Chapters (6)
Someone finally wrote the "Spike is a secret agent" story!
Instant like, though your formatting for the dialogue is kind of weird.
Dragon. Spike Dragon.
oh this is going to be fun
Q: will at any point Twilight and friends discover Spikes secret? like saving Twilight from the BBEG and his doom laser?
4092733 Thanks!
About dialogues: I tried to follow some guides, I'm not native English speaker so I don't really know how to write this properly. 
4092920 I do not plan on him being exposed, but I do have (a pretty ambitious) plan to make this into a series (that would pretty much tell what's going on when Spike is not in the episode).
It would prove to be quite the twist if Spike had to betray at least Twilight at the end of all this because of his being a secret agent.
pretty cool.
4104163 Thanks!
4104226 your welcome
4092733 I've changed formatting of dialogues, because my friend also said it's weird. ;] Hopefully it is more to your liking.
In other news: chapter 2 almost ready.
Excellent...
FIRST COMMENT
swag
Secret Agent Dragon.
Being a secret agent means you got to have Swag Charisma when it comes to the ladies.
Spike is swa~ag city
This Spike is awesome
5150202 Thank you. ^_^
But Spike is always awesome, especially with moustache.
Good thing Spike's immune to lava.
Let me introduce myself , I'm Mr. Gemfinger & this is Ms. Marshmellow Galore.
(or Pony galore)
banana !
"Do you expect me to talk?"
"No Spikey poo ,I expect you to cry"
Love it !
S is Spike?
Yes
5151657 His scales are. If he had been cut, the lava would have gotton onto his actual flesh, and burned every non fireproof thing In his body.
I want the gang to eventually find out (and maybe one or two of them lose their shit) or spike has to betray equestria(for its own safety)
Moar.
fc03.deviantart.net/fs70/i/2014/341/a/d/marshmellow_galore_by_hillbe-d890pz1.jpg
fc02.deviantart.net/fs70/i/2014/341/7/1/octopony___octohoofy_by_hillbe-d890pyc.jpg
COMMING SOON TO A THEATRE NEAR YOU
Holy shit, you actually came back and gave it a new chapter after over two years?? It's a wonder that others haven't heard of this story being updated yet...
7884288 I tried to write this chapter for quite a long time... Some of it was already written two years ago. ;P But then 'stuff' happened... I've tried to finish it many times. ;)
Leeerooooooooooooy jenkins *runs in and dies* well at least i got my chicken