Round 1 begins

Tawnee dropped to her knees next to her bench and licked the tip of the dildo. Then she gave it a long lick from base to tip.

"It's not even turned on yet, dear." Sakua said.

"Joehst gettin in the RRRRLLLK... mood!" Tawnee answered her. Rubbing her mons with her fingers, she pinched her nose shut and again took the dildo clear to its base.

"Oh my..." Chigusa blushed at the sight.

"The first round will be a fifteen minute test of skill. In top ride position you are to use only your pussies to stimulate the dildos. Whichever one of you forces the most orgasms from your machine whilst cumming the least shall win the first round."

"I dahn't dink I can do dis frahm a cahld start." Shannon said. "These are... oooh." The dildo slid in, and quickly adjusted, rubbing her most sensitive spots. The lubrication felt... good.

"GLLLMMM... ack!" Tawnee came up for air, her eyes tearing up. "What's wrahng wit you prudecoehnts, dahn't you know a good time when you see it?"

"Shoeht de FOEHCK oehp Tawnee." Shannon said.

Chigusa shivered as she sat down on hers.

"Now taking bets!" Ivanka shouted. A long rectangular monitor below the three main ones that they hadn't noticed lit up, it looked like gambling statistics but the girls couldn't figure them out. "And Tawnee do not forrrget zat you arrre kompeting not just enjoying yourrrself!

"Round begins in three... two... one... "

A bell rang, and Shannon felt her dildo come to life, even though at this point it only grew slightly warmer. Tawnee leaned forward, rocking her hips up and down, slamming down hard on the dildo each time. The monitor lit up with stats. Thrusts per second, thrust strength, kegel grip... there was also a clock counting down from 15:00.

Shannon gave up on trying not to let the situation get the best of her. "Tawn you know I can cream you whenever I want, so don't try to act tough in front of the audience!" She planted her hands on the bench and leaned forward, working her hips.

"Quit pretendin' you know yooehr way arooehnd a todger lezzie!" Tawnee stuck her tongue out.

"pPease, coehnt, I've tapped fans ooeht 3 at a time while you were coehmmin yooehr brains ooeht! Remember dat time at de show we ded at de lesbian biker bar?"

"Stahp tryen' to toehrn me ahn, cheater!"

The clock just ticked past 10:00, and all three girls gasped. The dildo grew. Not tremendously, but by about an inch in length and a quarter in width.

"Mahre like it!" Tawnee slowed her thrusts, going long and slow.

"Foehckin' betch i'll show you..."Shannon growled. She clenched as hard as she could with her pussy and rocked her hips faster.

DING!

Both Irish girls jumped. Even though she was between them they'd forgotten about Chigusa. And now the monitor was lighting up saying that she'd scored against the machine!

"What? De lettle schoolgirl? I..." Shannon suddenly realized how turned on she was. She tried to look at Chigusa's stats. It looked like Chigusa had some kind of pulsing technique she was using, but... she couldn't think about that little girl taming that dildo while she was struggling.

BUZZ!

The monitors showed that Tawnee had just cum.

"I ded naht!" she insisted

"You're..." *gasp* "...droolin." Shannon said.

Then the clock hit 5:00.

The dildos expanded again. Shannon gasped, and...

The buzzer and the dinger went off. The size change had made her cum, but she'd clenched hard enough to finish the dildo as well.

DING!

Chigusa was ignoring the Irish girls. She was even rubbing herself with one hand, just riding the thing slowly, twisting her hips at the bottom and the top, and judging by her numbers, the size increase had done more damage to the dildo than it had to her.

DING!

Tawnee had finally scored on hers, but she was glassy eyed, not even talking garbage anymore.

DING!

Shannon stared at the schoolgirl idol, who had a serene, slightly smug smile as she worked her dildo. As she took in the sight...

BUZZ!

BUZZ!

Shannon came, hard, and hearing it apparently took Tawnee over the edge. The clock was counting down from 0:30. Chigusa grabbed her bench tight and hooked her legs around the bottom. She jerked her hips forward, fast and hard.

DING!

Although there were several seconds left to go, Chigusa didn't let up until the final bell rang.

"Final skorrre! Arrrrghh ! Thrrree to white, negative one to grrreen, negative tvo to brrrown! Ivanka shouted.

"Fuuuuck..." Tawnee pulled herself off hers and just laid on the bench. Shannon stood up then sat back down.

"Bettors collect. Water for the competitors." Sakua handed each girl a water bottle. "Round two to begin in 5 minutes."

"What's round two?" Chigusa asked

"Ah. This was just a demonstration of the endurance training function." Sakua was talking both to the girls and the fans hidden behind the one way mirrors. "Round two, the machines will be programmed to fight back! You will all be matched against the same program. This is based on the male wrestler to have most recently comprehensively defeated Mama Luv in a sexfight - The Black Hammer! A reminder that the girls are allowed to forfeit the session, and that bets may be placed on whether they forfeit and how long it takes."

Sakua turned to the girls.

"Impressed?"

Chigusa nodded enthusiastically, Tawnee nodded vacantly. Shannon just stared at her.