when i saw this post a fic immediately came to mind but i couldn't recall the name and it's been a while since i'd read it. i scoured a little and i'm
fairly certain this is it, but not 100%
My Highschool Life is Full of Cliches by NovemberDoll
also i don't believe Sess and Naraku's friendship was a huge part of the fic or anything, and it was on the teasing/mischievous side which i remember thinking was a humorous dynamic - it was my first seeing such a characterization of them. it's also more of a collection of interconnected drabble/oneshots, relatively lighthearted and cute, so i wouldn't expect huge amounts of depth regardless.
it's a nice fluffy read; a fic to sooth the palette after something longer and more plot heavy or your brain just isn't up for such a deeper fic
it
is a bit over 43k, but it can help fill time on your road trips and still not be too much to handle!