I definitely agree that this song is about a man who is madly in love with someone. I don't necessarily think the "petite machine" lyric refers to the other person: I think it refers to him. The kick drum rhythm in this song is strongly reminiscent of a heartbeat, and the heart can itself be thought of as a "machine" of sorts. He is saying that he is so devoted to this person that they shouldn't worry about hurting him, and that he will always be there for them to come home to because he is willing to overlook any emotional hardship they cause him.
I definitely agree that this song is about a man who is madly in love with someone. I don't necessarily think the "petite machine" lyric refers to the other person: I think it refers to him. The kick drum rhythm in this song is strongly reminiscent of a heartbeat, and the heart can itself be thought of as a "machine" of sorts. He is saying that he is so devoted to this person that they shouldn't worry about hurting him, and that he will always be there for them to come home to because he is willing to overlook any emotional hardship they cause him.