A Korean exchange student came to live with us at the beginning of summer and I've made it kind of a routine thing that I tickle anyone (as long as I think I know well enough so its not weird to them) at any chance I get. So After a month or 2, when she was settled in, she was annoying me to no end, just like yanno, like a sibling would do, saying your name in this whiney tone. Finally, I told her, as I tell most people, "You had better stop that, or else I just might have to do something about it." She didnt know about my fetish, and didnt know I was going to tickle her. She just kept on going, until I had finally had enough, and decided it was time to jump her. (Me being a 180 pound 6 foot tall male and her being under 5 and a half feet and weighing around 100 pounds, she didnt really stand a chance. I pinned her to the ground and said, "Hmmm....I wonder if you're ticklish....are you?" she started to try and wiggle away, but to no avail, she wasn't going to get away. In the most innocent voice possible "N...n..no...." I asked her if she was lying, and again she said no. I said "I don't believe you. Hm...I think I'll try your feet first." I flipped around and grabbed her ankles, holding them down. Then I verrrrrrrrry slowly ran my index finger up her arch, making her giggle and quiver. "Pleaaase *giggle* don't tickle mehehehee..." I said with surprise, "Oh! So you are ticklish huh?" With that I instantly started digging in, making her scream with laughter and writhe trying to get away but she couldnt move. She was the most ticklish person I had ever seen! I kept going for a good 5 minutes before finally giving her a rest. Already panting for air, she couldn't say anything to me. I decided that if her feet were that ticklish, she was bound to have a ticklish upper body too, perhaps even more ticklish. I flipped around again, and started wiggling my fingers towards her sides. she looked up at me and her eyes shot WIDE open as she saw where I was going (later I found out this is her most ticklish spot). I took both my index fingers and again ran them verrrrrry slowly down her sides. That was all it took. She instantly started bursting out laughing, this time bucking all around. It was actually hard to keep her on the ground. Finally I let out a final tickle assault as hard as I could tickle her, and started raking all around, poking and prodding. She screamed at the absolute top of her voice, and really started to buck around. after only about half a minute, she got me off of her with all the bucking. After that she never annoyed me again 😀