Mistress Rexos (レクソーズ) is the primary antagonist of all three episodes of the 2017 ero-doujinshi series "Seisenki Iris" (聖戦姫イリス) by author and illustrator Ikameshi Shokudou (イカめし食堂).
The leader of the evil alien organization known as Reizphopia, Rexos wages a full-scale assault on Earth. The attack is opposed by the planet's greatest fighting force, the "Battle Angels". When the leader of this heroic force, Iris, confronts the villainess, she gullibly falls into her trap.
Rexos takes Iris back to her lair and brainwashes her into a sex-slave. She adds that her entire purpose for invading Earth was to capture and dominate the heroine, who she had developed a strong infatuation with from afar. Thanks to the evil woman's dark powers, Iris submits completely; believing her sole purpose in life to be serving the perverted overlord.
With her prize obtained, Rexos declares that she had no more use for Earth, but decides to have a little more fun anyways. She has Iris corrupt fellow Battle Angel and friend, Astraea, as well as other members of her former team including its leader, Metis. From there, the former heroines of justice destroy cities, rape women, and murder any remaining humans.
As time goes on, Rexos desires Iris not just as a sexual slave, but a wife as well. She creates a ring by sacrificing the lives of 100 million women and compresses their combined life energy into the jewel. The union is completed and Iris eventually gives birth to Rexos's daughter who is later given the name, "Envy". The final page of the story shows Rexos making love to Iris, who in turn is using the dismembered body of the now-deceased Astraea, which has been transformed into an onahole.
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Full gallery: Mistress Rexos (Seisenki Iris)