Co-worker sat on my lap for a picture. Do you think it means anything?

[Patrick]

I have worked with this woman for 5 years and we are good friends. We are both happily married people and know each others spouses. Anyway, we share the same birthday and go to lunch each year to celebrate. This year, right after we ordered, she told me she brought a camera and said lets have the waitress take two pictures together to celebrate and told me we can each choose a pose. She chose to stand in front of me for the first one being I am much bigger than her. I then sat down and said to her as a joke, ok, how about you sit on my lap since I am so much bigger than you and tapped my knee. BTW, I'm about 6'3 220 lbs and she is no more than 5 feet and quite light. Anyway, to my surprise, she said o.k. what the heck and proceeded to sat on my lap. After the waitress left, she actually stayed on my lap for about a minute and we talked about work until the waitress came back with the drinks. Do you think it meant anything that she stayed on my lap until the waitress came back. Like I said we are both happily married and was just wondering.