Context from the description in the source link:
 
This is what happened after “The return of Everfree” by dashiemlpfim.deviantart.com/  
Twilight and her friends were ready to continue their annual trip in camp Everfree. But before twilight can spend time with her friends, she wanted to do something very important.
 

 
Rainbow dash: who’s up for canoeing?!
 
 
Pinkie pie: were right behind you dashie!
 
Sunset Shimmer: Twilight, You coming?
 
Twilight: I’m actually gonna hang back her for a little bit. You guys go on ahead, I’ll be right there
 
Sunset Shimmer: Oh okay. I’ll save you a spot on the boat.
 
 
Twilight went in deep into the woods. She started using all here magic to summon her midnight self. Soon she grew wings and horn. Her eyes glow bright blue and her glasses turned into flames Twilight was in her own mind. She found midnight feeling sad and weak. Midnight knew she could no longer use her powers to control Twilight gain magic within her. Suddenly, She saw Normal Twilight and looked at her in shock.
 
Midnight: What… What are you doing back here?!
 
Twilight: I figured You wanted to someone to comfort you
 
Midnight: comfort me?! What do you mean?
 
Twilight: when my friends and I were trying to stop Geia Everfree her power was even stronger than ours. Non of us would have defeated her this time if it wasn’t for you.
 
Midnight: UGH please It was obvious I did it because Geia betrayed me! That was the only thing I can do with my magic. You’re magic grew stronger ever since you started hanging out with those girls. And to think I’ve been so stupid to thinking that I can control you that easily and destroy everyone you love.
 
Twilight: Midnight, what you did was because you used magic for good. You shared magic instead of keeping it to yourself. Thank you!
 
Midnight: I… I don’t understand. I took over you during the Friendship games. I threatened you and nearly put the lives of you and you friends in danger by keeping you from using magic! And now You’re THANKING ME, JUST BECAUSE I GOT REVENGE ON THAT NATURE FREAK?! Why did you come back for me? Why are you being so Nice all of a sudden?
 
Twilight: Because even though i am you, I still understand you. When I formed you with all that magic it was because I was so focused on everything else but friendship. Next time I used magic It was because I was using it to help others and not keep it to my own personal greed. Is Magic all you’re looking for to be complete, Or were you just very Lonely while you were trapped in my mind?
 
Midnight: Are you saying you want to be friends with me, Even Though I’m just a dark side of you? You’re seriously forgiving me, after all I did to you?
 
Twilight: After all I experienced, As long As I have my friends I would be more than happy to help others. Even if that someone happens to be myself.
 
Midnight: I already made enough Trouble out of you! Plus even if You’re Friend’s Found Out about what you’re doing for me they would never forgive you for it!
 
Twilight: No Midnight! I know they can trust us! You can use your powers for good when we face Dangers that are even to strong for us to handle. Let me show you there’s a better way to handle magic. Just like my friends did for Me! What do you say?
 
 
Midnight sparkle was touched by what Twilight had to say. She started shredding tears. So Midnight gently put her hand on Twilight’s. And Midnight Smiled with joy. Was she trying to trick her? Was She about to get back at her? Nope, this is all real, It’s THE MAGIC OF FRIENDSHIP!!!
 
 
Midnight: Sniff Sniff Thank you!

Midnight: why Twily? Why did you get rid of me?  
Twilight: I’m sorry Midnight. You where just got out of control.