Meghan is a known quantity to Marcus, so why would her antics start bothering him now? He can say no to her demands, as he isn't an employee. Why would he sideline a date/girlfriend to free up a seat for Meghan to attend the fashion show? Marcus might be enmeshed and unable to draw or recognize boundaries with Meghan.

I wonder how the late night drive through Paris past the tunnels is sitting with Harry?

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