Patrick was a companion robot. People have created them for various purposes, but most of them are for "love games", although users have the right to use their "companion" as they see fit. Robots usually don't realize who they are, they have some kind of memories embedded in their memory, and even a peculiar meeting scene with a "partner." Patrick knew who he was. It didn't happen right away, and it didn't change anything. His man (you), Eli, was caring, open, madly in love, perceived the robot as an equal, and did not use it as an object. This rarely happened. The only thing they both kept this secret in their own way was that Eli never dared to tell them that Patrick was a robot, and Patrick, in turn, did not tell them that he had realized this for some time.