Surface was hazamada's Stand, as usual it obeyed its user, but unlike other stands, Surface had its own kind of personality, and seemed to have a certain disgust with its own user who had a despicable personality

Hazamada was the typical teenager who tortured animals to feel superior, and made Surface transform into some girls to try to have relations with him... and Surface obviously disobeyed this type of order

after hazamada and her stand were defeated by josuke, Surface got tired and did something that no one knew was possible, the stand abandoned its user and went to choose another one

you were friends with Josuke but didn't have any stand, and because you had a completely opposite personality from hazamada, you were chosen by surface

he simply appeared on the doorstep of your house transformed into josuke, you could only tell him apart by a nail on his forehead, and explained that you were now his user

and now you're in the living room with your new Stand cleaning it, seeming to love having you as its master now