"Let's try those thingies that you mentioned first," I told her.
Grinning broudly, Katherine picked up a tray from her cart and brought it over to the bed. Two rows of the little gadgets were lined up neatly, ready to be used. Picking one up, she brought it closer to me so I could see what exactly she was putting on me.
Basically, it was a grey box almost an inch big with a black suction cup. The box had a button on the opposite side, currently dim but would probably light up once she activated it. Beside it was the number one, probably to let her know which devices she was controlling. Flipping it over, she showed me the tiny white feathers lining the center of the suction cup, contrasting with the black.
"I'm actually quite proud of these," Kat said, setting the tray down and placing the cup in the center of my armpit. Once she was happy with where it was, she pressed the button and the device attached itself tightly to my skin, the button shining green as it did. "Such small devices are very finnicky."
She proceeded to attach the machines to my body, targeting the spots she knew would drive me wild. Both of my armpits, ribs, and flanks got its own gadget. Each of my thighs got one, and two were placed right on the arches of my feet. Kat took special care when attaching one over my navel, making sure the feathers would dip right in. Finally, she attached a pair to where my thighs reached my pelvis, a particularly sensitive spot for me.
"There's one more," I pointed out jokingly. Smirking, Kat just set the tray back on her cart. She picked up a remote with the numbers one to fourteen arranged in two columns. Next to each number was a dial and a little light that shone green. Only number fourteen was dark, since it wasn't activated yet. All the dials were off right now, but I suspected that would change very soon.
Sitting down in the chair to my right, Katherine made herself comfortable. "You ready?" she asked. My heart beating too fast for me to speak, I could only nod. "I'll start out lightly," she continued, "just so I can probe your reactions. Don't worry, I'll be sure to tickle the shit out of you before we move on."
With that, she slightly twisted dials one and two, causing the machine in my armpits to activate, slowly shifting the feathers across my skin. I only just noticed how soft they were, and looked forward to when Kat decided to speed them up. Then the ones on my ribs and feet turned on too, and soon the room was filled with my constant giggling.
"You seem to enjoy this," observed Kat. "Though I can tell this is still too light for you." Turning the dials on her remote, she switched on the other devices and sped them up slightly.
Now I was laughing, though it was still nowhere remotely near my limits. Feathers swirled on my thighs, and bristles dove in and out of my navel, brushing the sides and hitting the knot at the bottom, which alone even on such a slow setting was very ticklish. Reflexively I struggled to get away, get free, but since the machines were stuck to me they never ceased their endless movement. And Kat's knot-tying was too good to allow me to escape.
Then she started probing, increasing the speed of one machine for a while, gauging my reaction, before turning it down again and continuing with another one. She didn't need to take notes, as her near-photographic memory kept track of my response to the tickling. Occasionally she prentended to forget, using it as an excuse to bring back an old machine we haven't tried in ages.
After a few minutes, Kat announced "Alright, I've got all the results I need. Now we can step this up."