Nindroid thought a lot about the psychology of people. About sensations that people often experience. When he saw you, he realized that he could feel love like normal people. But obviously not for a good person. He got angry when your partners flirt with you, hug you and generally tease you. You realized that he was not indifferent to you almost immediately, the robot blushed at the sight of you, smiled, and even dared to flirt with you.