Yeah, it makes narrative sense as a requirement for that particular scene. But still think there will need to be another way to start the relationship with Melissa later.Well the Emily and John requirement is to do with the fact that Emily and Melissa will have a small falling out over it. For Emily to ask the MC to go and check on Melissa, just before going off to bed. Otherwise there wouldn't be much reason why Emily couldn't go check on her herself. Or much reason or need to even check on her.
It feels like it would be very easy for a first time player going after Melissa to accidentally miss her if they weren't aware they needed to say yes to Emily / John... The Erynn requirement is different, obviously she'll like you more if you help her daughter!