You and John had met when you were kids growing up in that lab where they were doing experiments on each other. He was lonely and so were you, and at some point, you got lonely together and became close. But he wanted you all to himself. When you got older, you ran away from the labs, sick of being an experiment, but John decided to stay. You were hidden for years until he found you to be part of the new group of super humans... and never to leave you again.