As the sisters were watching the events of the second booth they noticed the tickling stop and some kind of conversation between the staff and the bound girl. At first it seemed like the girl's session was over but instead they were called into the booth.
"We noticed the both of you looking into this booth quite intently. Our current visitor has requested us to include red 'extreme tickling' into this demonstration and we need an extra set of hands. Would you like to join in tickling her?" The staff named Lena asked.
Jenna & Abby looked at each other and smiled. "Sure we would love to!"
"Great! Let me get her prepared first." Lena said.
She along with the other staff girl named Kai attatched arm and leg binders to the X-frame, enclosing the girl's arms upto the elbows and legs upto the knees.
"Since we are simulating a red zone the bondage has to be even more restrictive." Kai explained.
Indeed Jenna & Abby noticed that the girl could barely move and her body was stretched very tightly against rack.
The two staff women also placed her feet into stocks and tied back the toes with strings making them totally immobile.
"This is very hot. We can tickle her very hard and she wouldn't be able to do anything about it!" Abby noted.
"That is exactly what happens in the red zones. You just have to take it, no matter what." Lena added.
"Can we do anything we want to her?" Jenna asked mischievously.
"What do you have in mind?" Kai smirked.
"There's something I've always wanted to see, and I feel this is appropriate for a red booth only - how about we tickle her feet during orgasm?" Jenna suggested.
"That's going to be very intense for her but we're going to enjoy it." Kai teased.
"How about you Abby? What would you do to her?" Lena asked.
"Mmm, how about applying a blindfold, gag and then the four of us can tickle her at the same time as hard as possible?" Abby replied.
"Tickle torture, I like that..." Kai teased before continuing.
"As for me, I'd like to see if she can orgasm from having only her nipples tickled."
"Quite naughty. I wonder how Ann is feeling after hearing about all the things we're going to do to her..." Lena teased the bound girl while removing her bikini top and bottom, leaving her fully naked.
"It makes me extremely horny just to think about it!... I think you should blindfold and gag me first, then tickle my entire body with oil. Then you can use feathers to tickle my nipples and pussy to orgasm while tickling my feet at the same time." Ann said lustfully.
"Just like I thought. The previous session has made you so aroused that you want to be tickled mercilessly without thinking about the consequences. Once we apply the gag there will be no opportunity for a safe word. Do you understand that?" Lena stated.
"Yes. I understand that I might be tickled beyond my limits, but I'll take the risk." Ann said.
"Good. Let's get started..."
As discussed Ann was soon blindfolded, gagged with a ball gag and oiled all over her naked body including the feet.
"Does it make you extra horny from being tied in such an exposing pose? Your armpits are stretched open, your belly is totally unprotected, your thighs are spread wide open and even your feet are pulled back." Kai teased.
Ann nodded eagerly to answer the obvious question.
"She is a very naughty one. We should totally tickle her like crazy." Jenna noted.
"Then let's begin!" Lena shouted, starting to tickle Ann's armpits with her hands. She dug into the smooth hollows, spidering her fingers freely all over their outstretched surface.
"Tickle tickle!" Kai jumped in at the same time, tickling her ribs and belly with dancing fingertips. Since the belly was a large area she focused on small spots and noted Ann's responses. Her sides, hip crease and navel were the most ticklish.
Meanwhile the two sisters took charge of the feet, Jenna at the left & Abby on the right. They too decided to use their fingers for now, tickling every inch of the pulled back soles from toes to arches and heels.
Most importantly all four ticklers were relentless and focused on tickling Ann as hard as possible. Soon tools like electric flossers, toothbrushes, scrubbers and attachable nails were brought in to tickle her even harder.
Ann could do nothing but struggle against the tight restraints as her body was tickled mercilessly. Soon her limits were reached and she screamed through the gag for it to stop, but unfortunately there was no safe word. The poor girl had to lay there and take the worst tickle torture she'd ever faced with electric toothbrushes running in her armpits, ten pointed nail attachments tickling her ribs, belly and thighs, an egg vibrator in her navel and two hairbrushes firmly scrubbing her feet.
"I wonder how long we can keep this up?" Abby asked while mercilessly scrubbing a foot.
"As long as we want. Are you tired?" Kai asked Abby.
"Not at all!" Abby replied, returning to scrub the foot even more vigorously.
The intense tickle torture continued for a full fifteen minutes before everyone decided to take a break and the gag was removed temporarily.
"No... More... Please..." The exhausted girl begged.
"But we're just getting started!" Lena teased. She handed everyone a feather each.
"We're going to tease you to orgasm now. Get ready." She announced.
All four ticklers now started tickling Ann's body slowly. Jenna & Abby stroked it slowly over the soles and between the toes while Lena & Kai tickled her upperbody including the armpits, ribs, navel, thighs and boobs.
"Time to find out how sensitive your nipples are." Kai remarked, flicking them with her feather and making them hard and erect.
"Unnnnnhhhhh..." Ann moaned in pleasure while stiffening in her bonds.
"Hey, did you see that?" Jenna exclaimed, noticing Ann squirt out a tiny amount of her juices when her nipple was flicked.
"What do you have to say about that Miss Ann?" Lena teased.
"Please... Tickle my nipples and pussy at the same time!" She groaned.
"Why don't we offer you something better?" Kai said, whispering something into Lena's ears making her smirk.
"Me & Lena have decided to suck your nipples gently while Jenna tickles your pussy with a feather. If you orgasm within a minute, Abby will tickle your feet non-stop throughout it. If you manage to control yourself and orgasm after a minute we will not only let you enjoy the orgasm but also tickle torture Jenna or Abby after this."
"I love these kinds of naughty games! Bring it on." Ann laughed.