musictkls,
I prefer tickling by direct hand and/or mouth contact. It feels more personal and connecting between myself and the 'ler. I have had 'lers tickle me with tools, such as hairbrushes, banjo picks, rope, electric toothbrush, etc., and they definitely tickle a lot. The most ticklish I get with my feet is definitely from toe biting, though! That drives me insane, haha. My toes are one of the most ticklish places on my body, so "squirmy mess" status is essentially instantaneous if the tickling is of an intense nature, such as biting. 🙂