"Twilight didn't get to finish her last question as she suddenly felt herself get taken up in an embrace, her face buried in black fur. Without a word, Nightmare Moon had moved closer to Twilight, drawing in and hugging her mother tightly to her chest as her great black wings encircled Twilight, joining in the embrace." - Past Sins, chapter 16. Past Sins was written by Pen Stroke and Batty Gloom This was a suggestion from TaionaFan369. I hope you like it!
I know it's implied Nyx is still standing, but their relative sizes meant that I cannot reconcile the scene with the vector. (It's the open wings that throws everything out.) To follow the scene literally would result in Twilight's head being completely obscured, which doesn't look that good. I also had to flip the scene horizontally, because Twilight stabs Nyx's right shoulder. You can't see it, but Nyx also has her left leg around Twilight as well.
Additional Files:Nightmare Moon version. Nyx version. An SVG file is available here: Nightmare Moon (Resources). Reuse: You must get Pen Stroke's permission to use the Nyx character. You are free to reuse this image, in whole or in part, and make any edits you wish. You are not allowed to reuse anything I do for commercial purposes, including dA points and making prints available. If you reuse it or post it on another site, I ask that you include a link back here.
The Nightmare Moon and Twilight Sparkle characters and My Little Pony: Friendship is Magic are the property of Lauren Faust and/or Hasbro and/or others. The Nyx character and Past Sins is the property of Pen Stroke. Reference: Essentially a cutie mark-less Nightmare Moon.
Spoiler warning: At the end of Past Sins, Nyx basically destroys what remains of Nightmare Moon's essence, so as to prevent herself turning evil as Nightmare was.
Nyx is still Nyx, even if her past of Nightmare Moon, so she's not evil anymore, right?