You can try fanfiction.net. It has a large collection of fanfictions from various fandoms, and there are likely to be some good ones for Keita x Kazuki from Gakuen Heaven there.
One good story could be 'The Bond of Keita and Kazuki'. It focuses on their growing relationship within the school setting. They face challenges together and their friendship slowly blossoms into something more.
They could participate in a school competition together, like a sports event or a talent show. Keita and Riko would practice a lot, and during this time, they would have many sweet and funny moments. There could be some friendly rivalry with other students too. And as they strive for victory, their relationship could develop further, with Riko cheering Keita on in a really enthusiastic way and Keita being inspired by her support.
Ge Yue's works mainly included " Full Time Expert,"" Choosing the Heavens,"" Battle Through the Heavens," and so on. Among them," Full Time Expert " was a novel set in a game. It told the story of an e-sports player who returned to the professional circle after an unexpected retirement. " Choosing the Heavens " was a novel with a fantasy background. It told the story of a young man who grew stronger and stronger after crossing into another world and facing various challenges and difficulties. " Battle Through the Heavens " was a novel with a fantasy background. It told the story of a young man who started from an ordinary starting point and continued to struggle until he finally became a powerful martial artist.
"Dragon and Phoenix: Wifey, Get Your Marriage Certificate,""The Heavens 'Calamity: Starting From Naruto,""The Chief's Little Wife," and "The CEO's Sweet Wife," were all works by the author, Ge Yue. I recommend you to read "The President's Sweet Wife", a love story between a rich and powerful female lead who had experienced a world-changing life and a lonely male lead. I hope you like this fairy's recommendation. Muah ~😗
Sure. One great 'naruto y kazuki fanfic' is 'The Bond of Naruto and Kazuki' which focuses on their adventures together in a new land. It has great character development.