Of White Hair and Simple Smiles

A 24-year-old Gojo Satoru doesn't quite understand why there's an unhealthy level of his own curse energy flowing in one particular area that he's never been in. He also doesn't understand why when he manifests himself there, he finds a miniature version of himself with a single mole. Or, Kakashi Hatake dies and is reincarnated as Gojo Satoru's son.