A bit of sabotage never killed anybody.

All of these girls already have bikinis, they don't need more! You need to win this. S-so.... it's not really cheating if you sabotage the others, just a little bit.

The first girl returns from her walk across the catwalk, and a second girl stands up. Luckily for you, she tripped a little bit on the shoddily-placed planks and broke out into happy giggles, so the audience was only cheering a little bit! As the next girl stands, smiling, to make her way over to the catwalk, you sneakily take the tied strap of her bikini top between your thumb and forefinger. Before she gets all the way up to standing, you gently pull on the strap, subtly undoing it from where it's tied with the other one.

Success! As she straightens out and starts happily dusting off the sand from her bare legs, you've completely undone the bow without anybody else noticing. It's only held together by the strings being sorta flopped over each other, there's nothing really binding them anymore. Haha! Now the crowd won't cheer at all, because she'll be being dirty. Time to get to work on the next person....

You get through a good amount of the other girls by the time the first girl's reached the stage, ready to do her work. Your nimble fingers are just too quick~! Hehe, this is like a fun little challenge. How many tops can you undo before-

The crowd gasps loudly as, in the middle of the first girl's over-the-top catwalk routine, her bikini top is blown off by a surprisingly strong gust of wind. Okay, yay, this is it!

It takes her a few seconds of staring down at her exposed chest to process exactly what just happened to her. That time means a few more seconds of everybody else staring at her exposed chest too. When it finally sinks in exactly what happened, her eyes shoot open wide and a powerful blush covers her cheeks.

"K-KYYAAAAAH!!" She shouts, hunching over forwards and whizzing up her hands to clamp over the front of her boobs. Her palms cover the sensitive nipples, standing firm at attention from the sudden cold as well as the sudden shock, and her fingers sink into the pillowy abundance. A moisture takes to her lower half as her knees bend inwards, still shouting out, chest spilling out between her fingers and palms rubbing against the stiff nubs that cap her bountiful orbs.

Seeing her red-faced and burning in embarrassment, and after taking a bit of time to take in the sight themselves, some of the other contestant girls jump up to run over and try to help her. In their hurry, a good number of their own bikini tops are either flung off or at the very least slid out of the way, resulting in a number more shouts and red faced as the audience sits still and silent at the view.

In total humiliation at being seen with their top halves completely bare by such a large group of strangers, the congregation of covering up bikini girls run their way off to the change rooms. Some of them will be able to readjust and return later, sheepishly avoiding eye contact, but all of the girls who had their tops escape them fully are stuck trapped in there. A whole horde of topless girls, red-faced and hiding from one another, completely mortified each time a casual beachgoer steps inside the building.

That's score one to Debbie, zero to bikini girls! Hahah.... um.... you actually feel pretty bad. You just disgraced a bunch of fit and dignified pretty women, who probably won't be able to face the beach for a few weeks now from the shame. B-but, maybe you'll win, at least?

Nobody comes back out of the changing rooms just yet, but a few members of the audience do stand up to join them inside for one reason or another. To pay respects to the needy and degraded? Probably. It's not like there's much else to do with a bunch of humiliated and helpless young ladies, who need both hands to cover up. Hopefully those audience members can make them feel better.