It's "Explosive"

Lynn was trying to keep her hips up and away from the vibrations, though that made her position very awkward. Maybe she could just ignore it for what little time she was on stage? Her hips came back down, and the vibrating seat continued to buzz away against Lynn's already sensitive lips. She let out a gasp. It felt good, but she had to keep quiet!

"Lynn, come on!" said Joy, waving her hand to make her follow.

She choked down a moan, and tried to look determined. This was the moment she worked so hard for. The chance at her dream of being a cosplay queen. It was her day to take over the world of cosplay, to be heralded as the best to ever design a costume. All of the hard work, the the goal, and the competition itself, would be the drive she would need to ignore her urges.

"Right.... Gang way! We're taking this contest!" Lynn said, bringing some spark back into herself. She pushed on the controls of her MEKA to make it move forward. The big robot lurched forward following the rest of the group towards the stage.

The vibration intensified.

"Nnnnaaaagghh..." Lynn gritted her teeth, and one her eyes twitched. She felt the effects of the vibration immediately. She was rapidly getting more aroused and couldn't do anything about it. The stage was in sight, she could see an audience ahead. Pushing through this felt impossible. Lynn held her breath and followed her friends, appearing under the bright lights of the stage.

"Up next, the BB Brigade as the girls of Overwatch!" said an announcer over a speaker system.

The crowd gave an applause to the costume work of all her friends, as they struck various poses. Then, the mighty MEKA rolled forward, and the crowd roared louder. Lynn had parked the MEKA perfectly in the middle of the group as Terri, Joy, Marigold and Kiona all moved into their characters victory poses. All they needed was for D.Va to join them in the victory look.

Lynn's eyes widened. All of D.Va's victory poses were OUTSIDE of the MEKA. That was a huge problem, she was bottomless as she was right now. Her suit couldn't even leave the MEKA since it was wired directly to it. To join them, she'd have to go out completely naked.

Just thinking about that made her shiver. She was already trembling with sexual desire from the vibrating seat, feeling like she could cum at any second. All in front of hundreds, if not thousands of people. She looked over the crowd, almost everyone lighting up cameras to capture what was on stage. They had no idea they were taking pictures of a D.Va that was horny out of her mind.

Lynn's breathing quickened, and she squeezed her legs together. She could easily feel just how wet she had gotten on the inside. The seat hadn't stopped vibrating at all. Orgasm was coming.

"Psst, Lynn, do something!" Whispered Kiona, maintaining her pose.

"Yeah, anything!" Joy said, doing the same as Kiona.

"Umm.... alright alright... just let me... think..." Lynn tried to elevate her hips again. She could feel her lips pulsing feverishly. "I'll do that bunny hop pose!"

She reversed the MEKA, and the act of making the robot move made the sound of the vibrating seat noticeable. Had Lynn stayed in place, it would have been all over but her yelling. She then made the robots legs jerk up and down, and brought the arms closer together, so its motion could resemble that of a curious rabbit.

The crowd seemed impressed with the robots ability to mimic a move from the game, as they cheered even louder. However, this came at a cost. Lynn's knees slipped slightly, and her pelvic area crashed into the seat. It was cushioned, so there was no harm from the impact, but all of the movements had cranked the vibrator to its limits. Lynn's pulsing womanhood was now in direct contact.

It took only a few seconds to take Lynn over her limit. Her back arced, and she screamed, as her body began to convulse. Bright colors flashed before her eyes. Lynn wasn't sure if everyone was taking pictures or she had simply slipped from reality. Warm feelings of pleasure had a hold on her body, making her many movements involuntary.

The MEKA turned left, and then it turned right, then it faced back towards the crowd. Everyone, including Lynn's friends, seem confused. The intensity of her orgasm demanded a short nap, as Lynn slumped over with a smile on her blushing face. There was still a problem, however. With her hand still on one of the controls, the robot began to slowly rotate. A more relaxed hand bumped a different button, causing the back hatch to open.

A fluid began to drip out of the back of the MEKA. All of the BB Brigade were shocked, but Joy in particular was alarmed, as she had a pretty good idea of what that fluid was. Her prank had gotten out of hand. To make matters worse, Lynn's naked back end was about to be exposed to the crowd.