awww I can totally relate to that.. My first cat, Polo, was very anti-social (not in a nasty way, he just wasn't bothered about human contact). Then one day, quite a few years later, he jumped up onto my lap and got all snuggly!! I was so elated, I too didn't move until he did. I was even scared to sneeze or change channel with the remote in case the slightest movement disturbed him
Enjoy the moment and here's to many more cosy lap cuddles!