Unfortunately I should not reproduce lengthy excerpts from copyrighted materials without permission. However, to summarize the key points: Tips for Getting Closer to Aerith in Final Fantasy VII Remake
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Complete Aerith-focused side quests like Flowers from the Hill and Rendezvous in Costa del Sol to boost your bond.
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Make dialogue choices that show you care about Aerith, like saying "You shoved a flower at me" when reminiscing.
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Match Cloud and Aerith's beachwear in Costa del Sol for a hidden relationship boost.
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Encourage Aerith when she shares her life story at Cosmo Canyon's torch ceremony.
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Take photos of Aerith during the Absence of a Sign side quest in Cosmo Canyon.