The original image comes from the hentai doujin We Must Expose the Wickedness of Orcs to the World!, by the artist dangan and first published in January 2014. In the comic, the main character, a policewoman elf, tries to arrest an orc for kidnapping a little elf girl, though the orc was helping her to find her mother and the policewoman actually wanted to have sexual intercourse with him, with the girl noticing the sexual tension between them (shown below).