You can try fanfic websites like Archive of Our Own (AO3). It has a large collection of Buffy - related fanfics, and you can use the search function to look for ones with the Buffy sub Xander dom theme. Just type in relevant keywords and browse through the results.
Some Buffy fan communities on social media platforms like Reddit might also be helpful. There are often threads where fans share their favorite fanfics. You can post a request specifically asking for Buffy sub Xander dom fanfics, and someone might be able to point you in the right direction.
If you want the clearest chapter reference, go to Chapter 89. Early on, Director Sun took a step back, "What's the rush?; later, the chapter leans on It's true about the go-kart costing one point, but this time we're using....
Look to Chapter 135 for the clearest answer. It begins with The sun blazed down mercilessly, but thankfully, the path to the mountain..., keeps building through Zhao Lang was also very humorous, and even the usually stoic Jiang Li..., and lands on Are you healed from your injuries?" Zhao Lang.
A practical answer is Chapter 108, because it turns the idea into a concrete scene. The chapter opens with In a glamorous Michelin three-star restaurant, Su Yinwan and Shang..., adds pressure through Jiang Yan, "...." Did he chew 20 times just now?, and ends on Hey, I've been waiting for you for.
The best chapter pointer here is Chapter 80, "Princess Wen, Your Lunch is Escaping!". It opens with Jiang Yan and Wen Jiaojiao, one so smug he was almost ascending to the... and closes on arrogant princess with Princess Disease, I'm totally for it, fam.] [Hahaha....
Look to Chapter 136 for the clearest answer. It begins with A few people retraced their steps back to the place they had just been., keeps building through They continued straight up the mountain path until the trees became denser..., and lands on Aunt Ying and the camera PD arrived soon after..
If you want the clearest chapter reference, go to Chapter 133. Early on, Watching Jiang Li and the others finish their meal and tidy up the table,...; later, the chapter leans on But when he went to the firewood shed to find a convenient wooden tub, he....
The best chapter pointer here is Chapter 113, "Morning Exercise Check-in Group!". It opens with The next day, Jiang Lili was up before dawn as usual. and closes on If things are really as you say, that is indeed quite serious..
If you want the clearest chapter reference, go to Chapter 117. Early on, Fragrant and cloyingly sweet potatoes and corn were out of the pot, and Qi...; later, the chapter leans on The searing heat made him grimace in pain, but he didn't let go, and he....
If you want the clearest chapter reference, go to Chapter 126. Early on, Wen Jiaojiao initially wanted to cause trouble.; later, the chapter leans on But when her gaze swept around and landed on Jiang Li, who was standing at....
Chapter 74 is the strongest chapter-level answer because it starts from Having seen Jiang Li's ID before, he knew that this person named Shiguang... and follows through on The man's phoenix eyes narrowed slightly, he looked at the girl sitting....