Fanfiction.net also might have some. Although the interface might not be as modern as AO3, it still has a vast amount of fan - created content. You'll need to search specifically for Famous in Love and then narrow it down to Paige and Riner stories.
Archive of Our Own (AO3) is a great place to start. It has a large collection of fanfiction from various fandoms, including Famous in Love. Just use the search function and type in 'Paige and Rainer' to find relevant stories.
A practical answer is Chapter 215, because it turns the idea into a concrete scene. The chapter opens with Jiang Li let out a light sigh and tried to adjust her posture., adds pressure through Not only did their free time increase, but they also felt less restless,..., and ends on He originally.
Look to Chapter 172 for the clearest answer. It begins with Not only Shu Yan, but the entire internet was shocked when they saw Su..., keeps building through Damn, what brand of make-up is Su Yinwan using?, and lands on Where's the chaotic scene I was anticipating?.
Look to Chapter 176 for the clearest answer. It begins with Shang Shaojing didn't suspect anything and popped the greens into his..., keeps building through The moment he chewed, he realized something was off, and without caring..., and lands on Everyone intentionally avoided that plate of.
A practical answer is Chapter 171, because it turns the idea into a concrete scene. The chapter opens with The afternoon rain stopped and started again, making the air even more..., adds pressure through Could this top star really be a flower that withers at the first sight of..., and ends on They.
Chapter 189 is the strongest chapter-level answer because it starts from Seeing his painstakingly planted roses trashed like this, even as a fan of... and follows through on Just after coming out of the bathroom, he saw the landlord's family all....
The best chapter pointer here is Chapter 188, "First in Grade, It Can Only Be Me, Jiang Cheng". It opens with With a "snap," the pencil Jiang Cheng was using to draw broke on the paper. and closes on I haven't even said anything yet, Zhou, why so nervous?.
A practical answer is Chapter 173, because it turns the idea into a concrete scene. The chapter opens with Jiang Li finally rose from her seat., adds pressure through Who knows how tough he plays behind the scenes;
A practical answer is Chapter 213, because it turns the idea into a concrete scene. The chapter opens with Jiang Cheng also noticed where Jiang Shixu's attention lay., adds pressure through Director Sun, please don't tell me the King for today is me again., and ends on As soon as they were seated.
The best chapter pointer here is Chapter 172, "Shang Shaojing is Here Too?!". It opens with Not only Shu Yan, but the entire internet was shocked when they saw Su... and closes on Where's the chaotic scene I was anticipating?.
Chapter 181 is the strongest chapter-level answer because it starts from Xiang Hao rushed to the police station as soon as he saw the trending... and follows through on Let's not be too hard on a young girl.] However, these defiant words only....