My Feet Are Ticklish

I have ticklish feet and I discovered it at the age of 10, when my friends tickled my feet during gym class.
I actually enjoy having ticklish feet except when I get a foot massage and I have to hold in my laughter.
When I was 15, my friend hogtied me and tickled my feet after I lost a bet in Pokemon.
Then at 19, I met a feet tickler who tied me to a bed and tickled my feet for hours.