Some humans land on the planet of Eqquis and have come to collect a specimen. The specimen ends up being. Twilight Sparkle. After years of torture and tests. She returns to Equestria having fully destroyed the organization that captured her and comes back a new mare.

Inspiration from Scorch215's story https://www.fimfiction.net/story/310913/soldier-of-magic

Note-There is no actual sex scene, tag is there for the mention of the action happening in later chapters