The transit of Mercury in Pisces squaring your composite Chiron in Sagittarius symbolizes a time ripe with the potential for profound healing, but this path is invariably strewn with challenges. Your collective communication, symbolized by Mercury, is compelled to navigate the nebulous waters of Pisces, veering from the clear, straightforward exchanges you'd normally favour. This period pushes you both towards empathetic and intuitive understanding, building a bridge from mind to heart, demanding a bolder kind of emotional intelligence.

Simultaneously, composite Chiron's placement in Sagittarius pertains to shared wounds connected to beliefs, higher learning or travel. Perhaps your perspectives clash, or a shared ideology previously binding you is buckling under unforeseen pressures.

The square aspect between Mercury and Chiron heightens these issues, bringing them under scrutiny, playing on a loop in conversations. Yet, there is immense evolving potential here, if addressed with emotional openness and malleability - essential Piscean traits. If the sensitive issues upstirred are met with mutual compassion and the willingness to loosen rigid beliefs, this stark period can indeed become a stepping stone towards a stronger bond.

However, it's crucial to honor the yin-yang balance: speaking and listening, questioning beliefs, inviting comfort in ambiguity. Discord may arise when one clings rigidly to a viewpoint or fails to hear the underlying yearnings of the other.

Chiron's influence inculcates the need to heal these shared wounds, while Mercury lays the groundwork for embarking upon this healing journey in earnest. By melding Piscean empathy with desirable Sagittarian qualities - an adventurous spirit, intellectual curiosity, and optimism - navigating these challenging perspectives can initiate transformative growth in your relationship.

Ultimately, this period is but an invitation to delve deeper, refine your communication, and fortify understanding, all of which are vital for the continual evolution of your shared journey. Remember, challenges are but disguised growth-spurts, and in meeting them, you shape a collective narrative of unity and understanding through vulnerability.

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