I suppose that serves as a good reminder that that contract is a rather pathological thing to begin with. I think it's good to show at least one bad consequence of that... ... besides, the happier ending is probably still coming :P
With parallel world bullshit you can explain everything :P Literally anything can happen because no rules were laid out so I'll be disappointed unless the dumbest stuff possible happens
I kinda like how all over place it is. My prediction for the ending that probably is not going to happen but I'll spoiler tag it anyway is that the "boyfriend" was actually somehow Lily all along, and they will merge both worlds with the power of some yuri magic bullshit.
I don't see how this is yuri exactly...
... well, I interpreted the ending as them getting so drunk they don't remember their fashion show frenzy at least :P
Sometimes these discussions do pop up and I'm always surprised that people hear actual voices in their heads when they think. I don't hear my thoughts, they just are there :P Not sure I can explain it any better