Their love story could be developed through a shared goal. Suppose there is a powerful and evil force that threatens both the ninja world and the supernatural world that Rias is from. Naruto and Rias have to work together to stop it. During this process, they rely on each other, share their fears and hopes. Naruto's loyalty to his friends is something Rias admires, and Rias' elegance and charm start to attract Naruto. Slowly, their feelings turn into love.
In the fanfiction, their love story could be set in a new world where both Naruto's and Rias' universes collide. Maybe Naruto is on a mission in Rias' world and they meet by chance. Naruto's unique powers like the Rasengan would be a novelty in Rias' world, and she would be intrigued. As they get to know each other, they start to care for one another, and love blossoms. It could also involve some cultural exchanges between the two different settings.
Chapter 368, "You Don't Deserve to Be My Mother", is the clearest early answer because it turns Lin Manru's situation into a concrete plot event. A useful checkpoint is the way the scene starts with I haven't detained anyone, how could I possibly detain him?
Chapter 471, "This is What Happens When You Abandon Sister Li!", is the clearest early answer because it turns Shang Shuyue's situation into a concrete plot event.
Chapter 725, "Still Want to be the Second Young Master of the Jiang Family!", is the clearest early answer because it turns Lin Manru's situation into a concrete plot event. The chapter gives readers a real answer by opening on Though Rong Jusheng is known for being righteous, he's anything but...
Chapter 698, "Brother Yan Was Just Forced!", is the clearest early answer because it turns Shang Shuyue's situation into a concrete plot event. The chapter turns that into something concrete by moving from Jiang Li immediately asked for some tools and colored paints.
Chapter 576, "The Electronic Pickles are Gone!", is the clearest early answer because it turns Ai Xiaochun's situation into a concrete plot event. A useful checkpoint is the way the scene starts with Tonight, Team Q exceptionally didn't cook.
Chapter 575, "The First Time Threatening Someone Feels Quite Marvelous", is the clearest early answer because it turns Sis's situation into a concrete plot event. The chapter turns that into something concrete by moving from Is there really no way to get any money out?" After some...
Chapter 731, "Ye Chu Died", is the clearest early answer because it turns Bai Lu's situation into a concrete plot event. It opens with Dean, can I really not do it? and closes on She'd been acting off these days.. The key payoff is that the chapter closes with "Why did you come to the sanatorium?
Chapter 707, "I am Daoist Qingfeng", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. The chapter turns that into something concrete by moving from Su Yinwan hadn't finished her dessert but, feeling agitated, had...
Chapter 797, "Bu Fan and Bu Chen", is the clearest early answer because it turns Bu Fan's situation into a concrete plot event. It opens with The night grew deeper, and while waiting for news, Jiang Li dragged...
Chapter 703, "Slap Oneself", is the clearest early answer because it turns Jiang Li's situation into a concrete plot event. It opens with Wu Daoshan quietly raised his head to size up Zhao Lang, and sure... and closes on Young Master Gu was intending to back Jiang Li..