Hey Luffe you might like to know your not the only on who has a very ticklish sister in law, mine too has very ticklish feet and i too enjoy tickling them and have had many fantasy's about tickling them and her.
Next time you tickle your sister in law's feet give them a little tickle for me LOL.
Well luffe666 my sister in law has size 6 feet and they are very ticklish, the best story i have goes like this.
WE were watching the t.v. one night when she came to visit and she sat in the chair next to me with bare feet, there was a very fat and bald man on the screen and she looked at me and said "he looks like you only you've got more hair" and started to laugh so i said "you might as well have just asked me to tickle your feet" she said "why", "well" I said "it would have had the same out come" and I lept from my chair and grabed her legs at the ankles and put them under my arms and held on tightly as I tickled her feet for all i was worth. She screamed and shouted and begged and pleaded with me to stop but there was no way that i was going to let her go, and i tickled her soles for over 5 mins until she said that she had wet her self.
That was the best i have ever got her and i'm hopeing for a repeat very soon and will let you know what happens.
Have you tickled your sister in laws feet agian yet???? i'd love hear about it.