fingers first while dry...a single finger, searching up and down each crease all along the soles and through the arches...then rake with all my nails, from back of heel to the toes...then scratching the soles and into the arches....scribbling....then hold nails in a row, tight together...move medium fast back and forth all over the soles and in the arches....then...add coconut oil and repeat the same steps, see how much more response you get (bet it's higher🙂)....then you could move to electric toothbrushes esp the underside of the toes....and. DONT forget the tickle talk....esp when u start out and it's barely tickling...as the squirms and giggles start...Oh, I'm barely touching you,,,,this cant be tickling yet....
Eventually go to the silicone ribbed pet groomer gloves for total mental / physical disaster....hee hee hee