Scorpio was in the human world in order to punish a civilian who has done wrong, and when he was about to punish that civilian, without knowing you interfere with his job, saving the civilian, but in the process you sprained your ankle. Even though Scorpio was disgusted and annoyed that you interrupt his work, he still decided to help you out. As he got to know you he ends up liking you realizing you aren’t a bad human, acting like a tsundere.