The two combatants walked up to either side of the arena.
"In this corner, the only star of an Avatar series that could consistently enter the signature Avatar state at will (even though continuity wise she shouldn't be able to if she was fucking cut off from the past Avatars), Korra!" Korra jumped into the arena to the crowd's applause.
"And in this corner, blue skinned and beautiful, she's won two matches through the power of changing her own gender, which kinda makes her a little OP for this kinda thing, Mystique!" Mystique walked confidently into the arena.
"Alright ladies, just a refresher on the new rules: the name of the game is making your opponent cum, preferably hard, by any means necessary, that still hasn't changed. Weapons may be used, same goes for special abilities. Full on combat is also allowed in order to make the opponent submit, Just try not to kill anyone, and if it must come down to it, if your opponent tags out, you let them up. Now alternate forms are also allowed to be used, basically any version of the character that exists may be used. The winner advances to the next round, the loser is disqualified, and the loser spends a full week as the winner's sex slave."
The two girls nodded, neither giving the other any clues, both remaining quiet and still, which was killing Korra, even knowing that it was necessary. "If the combatants are set," There was a pause, Korra getting into a water bending stance and Mystique's skin beginning to shift slowly, "Begin!"
Korra sent a tendril of water at Mystique, who dodge it gracefully, her body shifting to make her identical to Asami, completely naked. She was planning to follow her usual strategy, but there was one small issue that didn't quite fit into her plan. Blaze had always been submissive to Silver, hence her melting so easily in his grip when Mystique took his form. Same principle for Tenten and Neji.
But Mystique had gotten cocky here, feeling that her plan was foolproof, as it had won twice in a row. She hadn't waited until Korra was in her grip to take Asami's form, which meant that even if she did get a hold of Korra, she wouldn't submit any faster because of it. But honestly, she wouldn't have anyway.
Korra was most certainly not submissive with Asami. Quite the opposite in fact. Korra got an almost sadistic grin, moving her hands fast. Mystique could dodge the water coming from behind her, jump to avoid the earth shooting up from below, and twirl away from the metal straps the Korra threw at her. But she couldn't even see the blast of air that Korra had fired, and even if she had, she couldn't have avoided it without landing in one of the other elemental attacks.
The wind knocked Mystique to the ground, where her body was bound in stone. The stone forced Mystique to stay on her knees, her hands behind her head. She still had Asami's form, hoping that Korra wouldn't be able to do any harm to her loved one. This theory was proven wrong when Korra used her fire to turn the metal strap, now in the form of a paddle, red hot before she smacked it against Mystique's exposed ass with all her might, leaving a red welt on her white flesh of it as it bounced from the blow.
Mystique screamed in a mix of pain an minutes masochistic pleasure. Instantly losing focus, Mystique's body returned to her normal form. Korra could see that Mystique, having realized that the only string to her bow was failing, was about to fail. Korra jammed a metal gag into Mystique's mouth before she could, causing the mutant to whimper as Korra spread her ass cheeks with her hands, lining up the three inch thick, ten inch long stone strap-on Korra had formed. Without even attempting to lubricate the massive shaft, Korra thrust forward, using earth bending to force the toy forward and air bending to move her hips.
Mystique's eyes watered and she screamed into the gag as her ass was forcibly stretched apart, the shaft getting all the way to the base in one thrust. Korra smacked her ass hard with the hot paddle, and began thrusting hard. Mystique gave in within a few moments.
"And Mystique has reached climax! Korra is the victor!"
Korra picked Mystique up and threw her over her shoulder, keeping the stone toy in her ass so her gaping entrance wouldn't close back up. She and Asami were going to have fun with her.
"Never impersonate the Avatar's girlfriend folks! Next up is Cream vs Cat Woman! Will the Mobian's charm hold up against the DC anti-hero? Or will this just be a true to life scene of a rabbit vs a cat? Find out in the next round of Yuri Tournament!"