the nature of things by eggcustard
AO3 fanfiction / 10,706 words / 1 chapter / ExplicitManga ch. 97 spoilers ~ Based off the (unfortunately) canon fact that communication fairies are made from semen, this fic starts with Mithrun wanting to make a new fairy, but being unable to deal with a specific part of the process by himself. This is a slowish burn with mutual pining, and was very lovely!
Thirty-five by Idiot_sandwhich
AO3 fanfiction / 5,616 words / 1 chapter / Teen And Up AudiencesManga ch. 97 spoilers ~ Kabru is turning 35, and Mithrun is quite worried when faced with the reality that his boyfriend ages much quicker than him. Meanwhile, Kabru has no clue why Mithrun is in a bad mood, and Marcille's advice isn't helping. Nice domestic fic.
To Want Again by Bumblepuppy
AO3 fanfiction / 1,963 words / 1 chapter / General AudiencesManga ch. 94 spoilers ~ Kabru visits Mithrun several months after the fall of the dungeon, and Mithrun is nervous because he wants it to go well. Soft and sweet.
Swallowing That Fire by Minum
AO3 fanfiction / 5,351 words / 1 chapter / ExplicitManga ch. 62 spoilers ~ Kabru suddenly realizes that Mithrun probably hasn't jerked off in 40 years... of course he has to help him!
Three Days Left by sempre_balla
AO3 fanfiction / 1,452 words / 1 chapter / General AudiencesManga ch. 62 spoilers ~ Kabru realizes that Mithrun isn't used to human touch anymore, and because he considers that a basic need, he wants to provide some to the elf - but quickly gets frustrated at the difficulty of establishing boundaries with him. Nice and cozy.
Labru
✨ Accurate Models by KuriKuri
AO3 fanfiction / 12,459 words / 1 chapter / Explicit
An AU in which Laios is a video maker reviewing monster-inspired sex toys! Kabru dislikes monsters and monster fans, but when he stumbles upon one of Laios' videos, and realizes that Laios is actually knowledgeable about monsters, he starts to develop a crush... which leads him to create a monster dildo to get Laios' attention! This was really fun and good, and I'll even give it bonus points for a potential trans Kabru!
you're in my head (more often than i want) by EnnTea
AO3 fanfiction / 11,347 words / 1 chapter / ExplicitManga ch. 97 spoilers ~ Kabru has a crush on Laios but is overthinking just a tiny bit... I think this started as a pwp but evolved into a pretty cute fic!
Labrumisu
✨ Soldier, Poet, King by eerie_enchantress
AO3 fanfiction / 8,658 words / 1 chapter / ExplicitManga ch. 97 spoilers ~ Mithrun slowly realizes that he's in love with Kabru, so when the tall-man and Laios start dating, he starts to avoid them. Kabru loses his mind looking for his friend, until he realizes that what he feels for the elf might be more than just friendship. Laios is just cheering on them from the corner. A really lovely fic, despite its quite short length there's time to explore the characters' feelings, and space for both angst and fluff!