With the rest of the storyline, will the individual girls be constantly grouped into pairs (e.g. always Lily/Claire), or will there be the option to literally choose their partners. Where e.g. Lily, will be able to record a duet scene with e.g. Sarah, Jamie or Zoey and so on.
And, as you introduce more characters, do you already have initial ideas, or are we at a good point to give a suggestion.
Because it seems to me that it would be good to add more locations (besides the bar/gym/hospital). E.g. hairdresser/beach/spa/hotel or nightclub. Where, adding any of these, would involve potentially recruiting another girl.