They fight to strip each other

The two topless sisters stared at each other, each holding the destroyed remnants of their own bikini tops. Yang in particular was annoyed as Ruby gave her a smirk of victory for falling to her trick to strip her.

"You little twerp!" Yang said angrily as she rushed forward to grab her sister.

Ruby eeped as she turned to try and move out of range but Yang was too fast as managed wrapped an arm around her waist, pulling her sister's back against her impressive chest.

"Let go Yang!" Ruby yelled as she struggled in her grip.

"No! You're going to get punished for that trick." Yang said as she tried to keep hold with one arm.

"Why should I get punished when you're the one that started it!" Ruby rebelliously yelled back.

Yang's other arm snaked down and grabbed the waist of Ruby's bikini bottom. With a sharp tug Yang exposed her sister's butt as the red bottoms were pulled down to Ruby's thighs. She tried not to think about how the bare skin of Ruby's bottom now rubbed against her adomen as she continued to hold the struggling girl close.

"Ah! Yang what are you doing!?" Ruby yelled in embarrassment.

"What does it look like sis? Getting ****!" Yang said with a smirk.

"Well two can play at that game!" Ruby cried as she shot an arm out. She grabbed on to the side Yang's yellow bikini bottom and pulled down. Yang though was saved by her bigger ass and wider hips helping to keep her bottoms partly on, exposing only the top part of her butt.

"Ah!" Yang cried in surprise. "Why you little!" Yang redoubled the her efforts and Ruby's bottoms descended to her knees.

However, such an action meant that she had no hands to muster a defense with, and Ruby succeeded in lowering Yang's bottoms down to her thighs.

"Ha! Those hips won't save you now sis!" Ruby said in triumph.

"Look who's talking nude girl." Yang said with a smirk as another pull on Ruby's bottoms brought them almost all the way off. Ruby had somehow slipped a leg out and now her bottoms hung on by only her right ankle.

"I-I won't lose!" A completely flushed Ruby declared. She began to pull with all her might, **** to get Yang's bottoms off.

"Why you-!" Yang said, tugging as hard as she could to get Ruby's stubborn ankle to give up her sister's last clothing.

Both of them heard a loud rip from the thin fabric.

Yang found her hand full of the shredded remains of Ruby's bottoms, now useless as clothing. Likewise, her sister held the ruins of Yang's bottoms, equally useless and torn.

The two nude girls ceased their struggle at this realization.

"We...might have gone to far." Yang said.

"Yeah...I think so too." Ruby replied.

And so the two sisters found themselves completely naked with no clothing in the water at the beach.