The scene is from the below fanfic by @TheLemonSage.
ficwad.com/story/213011
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Temari kissed Naruto while pushing him back against the water’s edge of the grotto. Karura began to move towards the grotto’s exit, but was stopped as Temari grabbed her hand.
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This is the 57th chapter, where Naruto reaps the reward of Termari convincing her mother to play nice.
Water effects are troublesome, but why do I always end up using them...