There are many fanfiction platforms out there. FanFiction.net could also be a place to look for 'jealous kevin x edd fanfiction'. However, the availability really depends on what fans have written and uploaded. Sometimes it takes some digging through different categories and using the search function effectively to find the exact type of story you want.
Another option is to join relevant fan communities or forums dedicated to the source material that 'kevin' and 'edd' are from. There, you can ask fellow fans if they know of any good 'jealous kevin x edd fanfiction'. Fans often share their favorite works or might even be writing some themselves and can give you direct links or recommendations.
I'm not sure of specific 'jealous kevin x edd fanfiction' stories offhand. You could try searching on fanfiction websites like Archive of Our Own. They have a large collection of fan - created works and you might be able to find some great ones there with the relevant tags.