The transit of Mercury in Sagittarius square your composite Uranus in Pisces represents a time of intellectual stretching and awakening for both of you. Mercury, the planet of communication and logic, in the expansive sign of Sagittarius, is likely to bring you face-to-face with broad and philosophical viewpoints, making you explore subjects you might have overlooked. This curiosity, if directed wisely, can fill your minds with new ideas and insights.

Conversely, the stubborn Uranus in the accommodating but elusive Pisces indicates an inclination to resist adaptability. The square aspect may heighten this tension, agitating your combined emotional response patterns. As expected with Uranus, shocking, unexpected revelations or events may occur that challenge your conventional ways of thinking or communicating.

Handling such fluctuations in tandem could be the crux here. You might experience a shared need for intellectual independence, making it crucial not to allow the potential discord between an expanded worldview versus the unpredictability of the Uranian influence to lead to hasty decisions or confrontations.

Further, Mercury's quickfire style can make this period intense, as conversations may be charged with quicksilver debates that evolve into deeper dialogues. It is advisable you maintain an open mind, acknowledging and respecting individual perspectives and truths, as it can help foster a stronger bond between you.

The pitfall to sidestep here is to avoid engaging in miscommunications that could create turbulence and uncertainty. Instead, channelize the spontaneous Uranian energy towards learning, adaptability, and emotional growth collectively.

This transit, though demanding, can initiate an enriching journey towards a more profound understanding of each other and the world, provided you navigate it with patience, compassion, and a mutual willingness to adapt. The transition may be challenging but navigate it well, and it'll leave you with profound wisdom and an enduring bond.

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