I promise (Jayy Von Monroe fanfic)

Kacey is a ten year old. She is the strongest female superhuman who will turn immortal when she turns 18. Jaramey Jayy is Jayy Von Monroe, he is also the strongest male superhuman. He has waited a thousand years of immortal life for Kacey; the one and only; his life partner, but he must care for her after her parents died protecting her.