Guy wants to tickle me mainly my feet why is there a specific reason?

This guy who's also my best friend wants to have this date thing to hang out And like hug and he wants to tickle me he's like so determined to tickle me thou and we've been best friends for 10 years now I'm starting to like him like more than best friends
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Also we flirt all the time like for the last ten years we've had a total flirtashionship
Guy wants to tickle me mainly my feet why is there a specific reason?
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