Image imported from derpibooru
Original Description:

It was getting getting late in Pony and Mrs. Cake decided to stock up on some well needed supplies, picking the right time to shop by herself, as the stores in Ponyville are usually quiet at night. She went to the main store and saw it was closed, but luckily for her, there was a 24 hour store near one of the forests around Ponyville. She walked over to it, enjoying her alone time, when she heard somepony call her name from within the woods. At first, it sounded like Pinkie Pie, but it sound more like somepony screaming for help. She ran as fast as she can towards the voice, only to see a cupcake on the ground. It had her name on it. She got closer, looking around before something grabbed her from behind and lifted her up into the tree. She tried to break free but saw snake coils wrapping her up tightly, before the tail lifted her head up to see a snake smiling at her.

Mrs. Cake: Who are you?
Kaa: My… you are one tasssty pony! You fell right into my trap!
Mrs. Cake: I said, who are you?!
Kaa: Well, tasssty pony… I’m Kaa… and you are?
Mrs. Cake: Wait… K… K… Kaa?
Kaa: You heard of me?
Mrs. Cake: I’m not afraid of you!
Kaa: Your sssmell sssaysss differently! You reek of fear! I love fear!

Mrs. Cake kept her eye on Kaa, as he circled around her.

Kaa: For many yearsss… I’ve waited for thisss moment… waited for the time to ssstrike and reveal myssself to Equestria! No one trussstsss thisss sssnake anymore!
Mrs. Cake: I don’t blame th…
Kaa: You will not talk! You will trussst me… Mrsss. Cake!

Kaa then covered her mouth with his tail as he started laughing evilly.

Kaa: You’re probably wondering how I know your name! I can read mindsss… and that’sss how I knew your name! Now… trussst me… trussst in me…

Kaa’s eyes then transitioned into rings of colors, hypnotizing Mrs. Cake with it.

Kaa: Trussst in me… only me… I will take you to paradissse… trussst in me, Mrsss. Cake!

Mrs. Cake sat there before smiling widely, her eyes mirroring Kaa’s, as he smiled before taking her away. From that moment, no one saw or heard from Mrs. Cake again. Some say she was eaten, but other say she’s alive! Either way, she had a big smile on her face, as she surrendered her entire will over to Kaa, clearly happy to under his spell.

Special thanks for ScornedRemnant for the request.