It had been a full day since Brooke's "little" shower accident happened and her little sister, Allie, not only found out, but also only agreed to keep her secret if she did it again once their parents left the house for the night.

Brooke's belly had gone back to normal by morning but she was thinking about the evening all day. She constantly was reminded of how full she was and had gotten a small fear of possibly popping. As much as she wanted to back out, she knew she couldn't because her sister would spread word of what happened.

Her parents had just closed the door and her sister didn't take two seconds to run up to Brooke with a huge grin on her face.

"Hey sis!" Allie's grin widened. "Guess what time it is?" She smirked and gave Brooke's tummy a poke.

Brooke let out a deep sigh and responded. "I know..." She began walking to the bathroom with her sister as slowly as she could. "A- are you sure there's nothing else I can do?" She said nervously.

"Nope! But you don't need to take a shower. So just grab the extendable shower-head and drink from it like a hose!" Allie said, having also been thinking about this all day.

Letting out a small sigh of relief, Brooke brought a small folding chair into the bathroom and detached the shower-head after turning on the faucet and setting the nozzle to "stream". "A- Are you ready...?" She asked with her hand shaking.

Allie brought in a chair of her own, setting it down two feet in front of her sister and clasped her hands together. "Yep! Go go go!"

Brooke brought the nozzle to her mouth and pressed the button to begin the steady stream of water. She angled it so that it would perfectly down her throat without much need to swallow.

Not even 15 seconds later, Allie got impatient. "Come on! Hurry up!" She quickly reached into the shower and spun the faucet to turn the water on full blast. "There we go!"

Brooke very quickly felt the extra force of water as it shot down her throat and landed in her belly. She placed her free hand on herself to feel her tummy start to expand and winced a little in memory of the previous night.

A few moments later, Allie grinned as she saw her sister's belly button poke out from under her shirt. "Keep going!" She clapped her hands together gleefully.

Letting out a small whine, she kept going for a while longer. Her belly continued to surge out forward, sloshing as it was filled.

Brooke's shirt rose higher up her filling tummy until it rested nicely at the top right beneath her breasts. She took her finger off the button and stopped the water flow. Her belly had expanded more than double what it had the night before, resting in her lap, nearly touching her knees. She let out a small burp, followed by a hiccup and a slight groan, placing her hands on her globe of a tummy.

Allie's eyes were widened as far as her sister's belly in complete awe. "Wow! You're so big!" Her hands went straight to the fleshy water balloon in front of her and gave it a squeeze, making Brooke let out a squeak followed with a moan.

"I told you! D- Don't squeeze me! *hic* I don't wanna p- puke!" She responded as she tried to soothe her full belly, rubbing the sides in small circles.

Allie blushed a little and quickly asked. "How much more do you think you can fit in there?" She held the shower-head in front of her sister.

Brooke glared at her sister's idea. "Are you k- *hic* kidding me?! If I have even one more drop, I could *hic* burst!" She yelled in response, her belly so full that it shook and sloshed as she spoke.

Allie let out a small sigh in disappointment but didn't wanna push her sister too far. "Okay... Fine..." She did however, get another idea. "But... What about next time? Think you can get bigger?" She grinned.

Brooke's face turned bright red. "Why do you want me to do this? *hic* If it's so interesting, why not just d- *hic* do it yourself?!"

Looking down at herself, Allie thought for a second. She too had a small, slender figure, much like her sister. "Do you think I can?" She asked, placing a hand on her flat tummy.

Now, Brooke got an idea of her own. "O- *hic* of course sis!" She smiled. "I'll even *hic* help you!"

It was now Allie's turn to blush. "O- okay! We can try it tomorrow night!"