Archive of Our Own (AO3) is another great place. It has a very organized tagging system. So, you can easily filter for Mutant X slash fanfiction. There are often some really high - quality works there.
You can start by looking on fanfiction.net. It has a large collection of Mutant X fanfiction, including slash ones. Just use the search bar and type in 'Mutant X slash' and you'll get a list of relevant stories.
Some dedicated Mutant X fan forums might also have links or even host their own slash fanfiction. You can join these forums and ask around for the best slash fanfics in the Mutant X fandom.
The best chapter pointer here is Chapter 200, "Only Two Points?!". It opens with Shang dismissed the thought of turning around and walking away. and closes on Are you doing this on purpose?" Zhao Lang instantly put on an innocent....
Chapter 226 is the strongest chapter-level answer because it starts from What was all that before then? and follows through on Are you sure you can be on the list of winners?] Zhou Xu: [?.
The best chapter pointer here is Chapter 187, "I Really Need an Apology". It opens with During the competition, she passed by him numerous times, unfazed by... and closes on Perhaps it was a pig that tripped you; they are quite aggressive, after....
Look to Chapter 183 for the clearest answer. It begins with Seeing that he held a blue ball identical to Su Yinwan's, Jiang Yan..., keeps building through Yinwan, it seems we're destined to be partners," he said., and lands on Hadn't this woman been relentlessly pursuing him before?.
Chapter 223 is the strongest chapter-level answer because it starts from So, for the first time, Jiang Yan, who had always styled himself as the... and follows through on The damned Jiang Li was tricking him again!.
If you want the clearest chapter reference, go to Chapter 202. Early on, Jiang Li couldn't believe it, "Just to take a picture?" "Yes, just to take...; later, the chapter leans on If just taking a picture could earn thirty points, it was indeed worth it..
Chapter 190 is the strongest chapter-level answer because it starts from Several people who didn't understand fell silent. and follows through on Because he saw the pack of cigarettes pinched between Jiang Li's fingers..
The best chapter pointer here is Chapter 231, "vLet Me Check Out the Strength of 5000". It opens with Huo Xuan felt a burst of secret delight in her heart. and closes on A cool sports car was one hundred thousand bucks..
If you want the clearest chapter reference, go to Chapter 188. Early on, With a "snap," the pencil Jiang Cheng was using to draw broke on the paper.; later, the chapter leans on He looked up, the cold glint behind his glasses sending shivers down one's....
A practical answer is Chapter 225, because it turns the idea into a concrete scene. The chapter opens with When Zhao Lang's devastatingly handsome face appeared, all six people..., adds pressure through Alright, it's about time, let's officially get started., and ends on Which big shot is.