Responses
first thing off the top of my head is this
https://www.mangago.me/read-manga/when_the_killer_falls_in_love/
(Sunshine Idol × Underground Killer; killer has similar upbringings to killua in terms of being born into killing, etc.)

Pls don’t take this the wrong way but I want to know if there is a bl out there with the dynamics/personalities that Gon & Killua have. Traumatized, sharp, witty cat-like boy falling in love with sunshine, simple-minded, compassionate golden retriever bc they are the first person that gave them happiness and allowed them to be themselves. Ideally there would be some power scaling fantasy in there and they are both strong and intimidating, sort of like Turning but not rlly although it’s the closest I found