One possible plot twist could be that their respective villages oppose their relationship at first. Since Naruto is from Konoha and Temari is from Suna, the political situation between the villages might make their relationship difficult. For example, there could be old treaties or grudges that get in the way. Another plot twist could be the interference of a third party who has feelings for either Naruto or Temari. This person could try to create misunderstandings between them to break them up. Also, a plot twist might be that Naruto has to go on a long and dangerous mission right when their relationship is starting to develop, leaving Temari worried and uncertain about their future together.
A practical answer is Chapter 119, because it turns the idea into a concrete scene. The chapter opens with What is Princess Wen talking about?, adds pressure through Director, pull over to the side of the road for a moment, and make a call..., and ends on For some reason, he always felt there was.
The best chapter pointer here is Chapter 83, "Can Actually Carve Flowers?!". It opens with When they received the task, the three of them were already sharpening... and closes on Since all the guests were staying at Uncle Zhao's cabin, Director Sun....
If you want the clearest chapter reference, go to Chapter 113. Early on, The next day, Jiang Lili was up before dawn as usual.; later, the chapter leans on But this time was different; as she got dressed and opened her room door,....
The best chapter pointer here is Chapter 79, "Finally, I'm not the last one anymore!". It opens with Jiang Li leisurely said, "I bought this weeding machine, and according to... and closes on Um..." Wen Jiaojiao bit her lip, "Could you, could you lend me the weeding....
Look to Chapter 89 for the clearest answer. It begins with Director Sun took a step back, "What's the rush?, keeps building through It's true about the go-kart costing one point, but this time we're using..., and lands on If anyone should be mocking her, it should be me.] Wen Jiaojiao stood to....
Look to Chapter 52 for the clearest answer. It begins with The village chief and the woman behind him exchanged a glance, "This..., keeps building through might not be a good idea, you guys are still filming, we don't want to..., and lands on And at this point, they might as well try a desperate.
If you want the clearest chapter reference, go to Chapter 108. Early on, In a glamorous Michelin three-star restaurant, Su Yinwan and Shang...; later, the chapter leans on The elegantly dressed waiters started streaming in, serving them various....
The best chapter pointer here is Chapter 77, "Why are you sabotaging me again?". It opens with Wen Jiaojiao's reminder calmed Shu Yan down. and closes on But who knew that the next second, the lottery box would be handed over to....
Chapter 136 is the strongest chapter-level answer because it starts from A few people retraced their steps back to the place they had just been. and follows through on Aunt Ying and the camera PD arrived soon after..
Chapter 125 is the strongest chapter-level answer because it starts from Next, it was Qi Tianyu's turn. and follows through on He deliberately chose the most inconspicuous wheat seeds..