Shephard, the music video is yet another story. Of course, I DO think it's of importance but I just was not patient enough to include this in my humble essay xD . I kind of plan to write "Part II", about my interpretation of the video but hell knows how long it'll take.
For short, I think that illustration adds things not included in the lyrics. For instance IMHO they do not reveal anything sexual but in the video Juliet stands her Romeo up so that she can taste some more girly company. The mystery woman is her guide. It is the other half of Juliet, the darker and more unpredictable one. Maybe the part that Julie had not wished to reveal, she did not allow herself thoughts like this. (That's why the character wears a mask and does not put it off till the very end... however, the viewer still cannot see her face!) The symbolism is like of the "Psychédélices" cover - showing the "normal", displayable side of a girl and the other, more tempting (the cake
).