Last night, Princess Twilight and Solar Knight was having a friendly conversation in the Castle of the Old Sisters.  
PSA: They are not a couple, just friends.  
EDIT: Yes, I just noticed that I forgot Solar Knight’s cutie-mark. But that is no big deal, right?
 
Then as they kept walking through the castle, they found Princess Celestsia. Looking out of a window with tears in her Eyes. Twilight and Solar went up to her and wondered what’s wrong.
 
Twilight: Princess Celestia, are you alright?  
Solar: Mother?  
Celestia: sigh Good evening Twilight, is there something bothering you?  
Twilight: Not at all, but what about you. Are you alright?  
Celestia: Well… I have to be honest with you. I…  
Solar: Is it about aunt Luna?  
Celestia: turns over to her son Yes, to an extend. But in reality it is about everything I’ve done in my youth. Turns over to Twilight Twilight, would you hate me if I told you that I was a total monster back then? A monster that ruined innocent lives just because a draconequus took advantage of me and got me inpregnated.  
Twilight: Celestia, you are not a monster… wait, YOU WERE RAPED!!  
Celestia: Well, if you Count it as rape then yes.  
Twilight: What happened?  
Celestia: “More-than-one-thousand-years-ago”, I met a pony at a summer-sun festival and fell in love with him. But because I was so idiotic and foolish, this pony who turned out to be a draconequus in disguise, got me pregnant. But it wasn’t until the tenth month of my pregnancy, I found out the truth. Yamantano Mikaboshi, which was his name, was destroyed by a combined magical blast from myself, Luna, Starswirl, Clover the Clever and an army of other powerful unicorns.  
Twilight: You killed him?it  
Celestia: I was driven by anger and the need to destroy him, for taking advantage of me and get me pregnant so that he could combine the genes of the Mikaboshi-clan and the most powerful alicorn alive at the time; me. So that our son would potentially become even more powerful than both of its parents.  
Solar: The Mikaboshi-clan?  
Celestia: turns over to her son Yes and when our son was born, I couldn’t bare to take care of it. So I abandoned it, in fear of being reminded of how easily I was taken advantage off.  
Solar: Mother? Does it mean that I have a half-sibling that is part-draconequus?  
Celestia: Yes, my son. I am not even sure if he even is alive.  
Twilight: walks over to Solar Knight so that she stands next to him But what has this to do with Princess Luna’s banishment?  
Celestia: Because after that incident, I became paranoid and assumed that everyone were potential backstabbers, including my sister. I refused to listen to anybody and jumped to conclusions on a hunch! I wanted to protect my subjects and my family, but in doing to ended up doing the exact opposite. Worst of all was with Luna, when I brainwashed my subjects into thinking that Luna was a traitor. So they didn’t show any affection towards her and thus made her lose more and more of her confidence. As the years Went by, it just got worse and worse until she snapped and turned into Nightmare Moon. After that… well I guess you know the rest.  
Solar tears in his Eyes: Mother! You mean you destroyed aunt Luna, just so you could show dominance over her?  
Celestia: Yes, my son! It wasn’t until I met your father, when I started to slowly recover from the horrible things that I’ve done. But then he passed away of blood-poisoning and I lost all my hope of being alive, until I met you, Twilight Sparkle.  
Twilight: So that’s the reason why Luna still doesn’t trust you?  
Celestia: Precicely, she also told me that I almost turned you into my old self. Because I was scared that Equestria might be entering another “dark-age”, with the return of Discord, Tirek, the changelings, the sirens, King Sombra, the ancients, Ragna Rokh, the Horse-flies and of course Nightmare Moon.
 
(IF YOU WANNA CONTINUE IN AN RP, THEN FEEL FREE TO. BUT PLEASE, DON’T MAKE IT SEXUAL. IN THIS CASE, IT WOULD FIT AND IT WILL RUIN THE MOOD)
 
Background by 90sigma  
Twilight by slb94  
Celestia by estories