The middle drags. There is a solid 30-minute stretch where the camera just lingers on dancing and drinking. You could easily skip 10 minutes of filler and lose nothing.
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By the time the moon was high, the weight of the "experiment" began to press down on all of them. As the night unfolded, the initial thrill of the forbidden was quickly overtaken by the sharp sting of jealousy and the unsettling realization that some boundaries, once crossed, cannot be easily rebuilt. The psychological distance between the two couples grew even as they remained in the same small space.