4 years too. Started when i was staying at my Grandma's house as my parents had both travelling jobs. My aunt (dad's sister) must be in her 20's then had knee length hair and used to ask me to help with her hair. One fine day my lil pee pee stood up, and i stupidly asked her what happened, why my little pee pee is different than the other days. I still remember the coy smile i got followed by a kiss on my pee pee.

That day started a new chapter in our relationship that still is going strong