Pinkie Pie is pretty blunt so it is barely Teen. Nothing explicit, no Sex and no Clop though.
Spoilers for the Prologue ahead.
This is an account of the Greatest Pegacorn ever. Which is faint praise indeed, because everypony who has been told about the birds and the bees knows that to be the Greatest among the Pegacorns, one would just have to live past twelve. Well with the great magical advances of the last centuries and his own diligent research and studies Princess Stella reached the age of forty, but his time is running out, so he sets his mind to disobeying Princess Celestia and seeking out the people who have a faint chance to help him. They will very probably fail and their Hearts will break, just like the Princess told him, but he doesn't care anymore. He wants to live.
There is an attached tumblr where the Story is mirrored without the Prologue or the Framing device of Diamond Tiara retelling it. There you will find the unedited account of Princess Stella. If you had lived in 2012 you could even have asked him questions there.
The only good OC's with wings and horn, are dead OC's with wings and horn. Or Pinkie Pie. And this story has both. It also contains the word rape and will imply accidental non-consensual stuff that felt like sex.
Diamond Tiara is a bitch and the author will imply she'll end up a prostitute. I'll better mature it now, before kiddies fave it.
Wtf is a "pegacorn"? I'm going to assume you spelt "Allicorn" wrong.
1478980 No. The difference between Pegacorn and Alicorn is explained in the Story.
1479003
Yeah, I read it and feel very dumb. Rating:
/
4/5 photofinish's
Could fix the first part of the story up, it is really hard to keep track of everything. Also, why do they call him a princess if it is a guy. Interesting though. Dont know why you have to rate it mature, didnt seem cloppy or gory at all
1479317 It's a Prologue. Everything will be kinda sorta explained in the actual story. The point was to make the reader think it's a stupid Mary Sue being described while the largely undeserved praise was in reality his eulogy. Which was given by a completely unlikable character. After that the explosion and stuff is to make the reader think "Oh, a superpowerful main character great..." While the superpowerful pony in my story is actually Pinkie Pie, which is justified in the first real chapter. He isn't a princess, his attention seeking mother who just wanted to produce an heir named him "Princess Stella", without even checking the gender(because all alicorns are female and he isn't an alicorn) and Names are magical. So changing your name could disrupt your Magic. That is no problem for a normal pony of course.
Finally it's mature because the next chapter contains Pinkie Pie. And she rapes physics.
Princess Stella is an O.C. ?
https://www.fimfiction.net/group/215474/folder/73610/oc