The Zoldyck's Nanny (Illumi x Reader)

Why is Illumi so obsessed with Killua? What if it was because Killua was not his brother, but his son? This fanfiction revolves around the idea that Illumi had a kid with the reader and Silva and Kikyo decide to raise the baby as their own and hire the reader as their nanny. This is an Illumi-centered story and his ag...