In the 'naruto meets kushina time travel fanfiction', their relationship develops in a multi - faceted way. Initially, there is shock and disbelief on both sides. But then, Kushina's motherly instincts kick in. She starts to care for Naruto, cook for him (as Uzumaki's are known for their good cooking), and protect him from potential threats in the past. Naruto, in turn, respects and admires his mother. He learns from her wisdom and her combat skills. Their relationship is not just one of a mother - son but also like comrades, as they might face some enemies together in the past. This unique relationship development is what makes such fanfictions so appealing to readers.
At first, it's likely to be a very emotional encounter. Naruto is overjoyed to finally meet his mother, and Kushina is equally amazed to see her grown - up son. They quickly form a strong bond.