Killua x Reader x Gon - Killua

[Y/N] comes from an assassin family that has the ability to regenerate at a incredibly inhuman speed, and immunity to poisons and certain diseases. Just like a certain white-haired boy, she does not want to be an assassin. [Y/N] later comes across the Hunter Exam, and to get away from assassinations she takes up the challenge. She meets new people, and despite being an assassin she's pretty innocent.

Gon x reader x Killua