Erynn's relationship is the key differentiator...
Does Melissa still go for it or having Erynn means she ultimately backs off and never acts on her desires?
If the choice to act comes then how we procede from there? How we tell Erynn? What would be her reaction and what happens to their relationship? It's basically Layla-Elena times 100x.
With no Erynn there isn't anything at stake...
Emily might be a little pissed off innitially, but Melissa doesn't have much of a relationship with anyone else... the worst it can happen is she loses a client

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