Squeaky clean.

Liz rose early in the morning, with the golden red sun just cresting in the distance through the window. She felt well rested after last nights incestuous escapades, and her brother was still soundly asleep on the musty pile of sheets they produced the night before. Even though there was little her parents could truly do to punish her at this point, they were still her parents, and she had no desire to disappoint them so thoroughly as she had during her physical yesterday. With that thought in her head, she gently lifted Josh off of his bed and placed him on the futon he had for bringing company over. He stirred slightly, but was still far too exhausted to wake from his deep sleep. Disposing of his ruined clothes, gathering the bedding for the laundry, swapping the pillows from between their two rooms. They would find it far less odd to find her pillows thrashed than her brothers. She had no clothes of her own to take care of, as her magnificent stature left her no options for garments except 'birthday suit.'

When she was finished with her self-imposed chores, she took one final survey to make sure everything was in order before their parents woke up. Alas, there was two hefty messes left to be cleaned, for they were both still covered in the dried remains of their bodily fluids. She could easily shower herself, but how would she care for her brother without raising suspicions. This was, after all, not a house where brother and sister regularly bathed each other. As she sat on the bed and pondered her dilemma, her brother slowly awoke, grunting in discomfort.

"Good morning Liz. I suppose I should be grateful that you left enough life in me for another day." he grumbled. "I feel more sore than I've ever felt, and you know I spend most of my free time lifting weights."

"Excuse me, Mr. Grumpypants" she jested. "When you go through such a thorough transformation as this, you can explain to me how easy it is for you to keep your hormones and urges in check! You know I still care about you."

"Alright." Josh sighed. He had to admit to himself, puberty made him do some crazy things, and she was having a development like none before her. "Thanks for cleaning up my room." he said, finally noticing her handiwork.

"You're welcome." she said, sincerity evident in her voice. "We still have to figure out how to get you cleaned up though. Can you stand well enough to take a shower? I don't think mom and dad would appreciate finding us in there together anymore than they would finding out what we did last night."

"I can barely lay in bed, let alone stand up. So what if they find us, I'll just tell them the truth: I needed your help and I asked you for it." Josh said as he stretched his hand out to his not so little sister.

And with that, Liz took her brother in her arms, and did her best to carry him through the threshold and into the bathroom. If only the doors were made for someone of her stature, though eventually she did manage to get the both of them inside. Unfortunately, their parents had updated the bathrooms in the house, so they had a large walk in shower but no bathtub. With Josh unable to stand, her only choice was to hold him up. It was awkward at first, as she attempted to lift him while hunched over, any attempt to let go long enough to clean him resulted in a close encounter with the tile floor.

Frustrated with her lack of success, Liz sat down on the floor with her brother on top of her. It was pure serendipity then, when her brother leaned back and nestled himself between the impressive shelf upon her chest. A matching pair of puzzle pieces. She began to lose her cool, her cock twitching beneath her brother, as her ever present hormones began to warp her mind again.

"What's going on sis?" Josh asked. "That's not going to help me get any cleaner!"

"I can't help it. It's like it has a mind of its own!" she cried. "You better finish up before it gets the better of me. All this soapy suds are rubbing me the wrong way!"

Indeed, before long her mast was erect and hard as a plank, her brother straddled across it. Liz's breathing became heavy with the focus required to keep from escalating the situation, but all the focus in the world couldn't keep the thoughts of a hot white shower out of her mind. A twitch of the cock, a tingling in her breasts, a quivering in her folds. It would be all over soon, and then they'd have to start all over.

"Finished!" declared Josh. "And not a moment too soon it seems."

Slowly, Liz began to rise once more, steadying herself upon the walls of the shower. Her brother, already seated upon his perch, was lifted effortlessly by her tumescence. Knowing that she had to release, Liz plucked Josh off her pecker and placed him on the bathroom floor, before closing the stall door once more. Now, she could find the release she needed so badly, knowing that all the evidence would be washed away easily. Giving in to the pleasure didn't take long, as the twitching intensified and pre began dribbling out of her spearhead. Soaping up her rod for extra lubrication, she began to go weak in the knees, and had to drop to the floor to continue her session. Splat! Her first thick rope of cum lashed out at the wall. The next one followed suit, slowly changing trajectory as Liz brought her canon towards her face. "A growing girl needs her protein." she thought, as she began to greedily suck down her own fertilizer. She quickly realized what it must be like for her brother, as her seemingly unending barrage of semen worked it's way down her throat. Even at her gargantuan size, it was too much to contain, and her belly began to swell slightly. Finally, after several minutes, Liz was spent. Her cock popped out of her mouth, dangling at a low angle as the blood gradually returned to her body. She made quick work of cleaning up after herself, and then made her way out of the shower to join her brother.

"So how does it feel to be stuffed like a twinkie?" Josh jested. "It's not easy to contain your volume is it?" With that he patted his swollen belly for emphasis.

"I will admit, I am quite impressed at your ability to contain me, in more ways than one." she replied, scooping him up off the bathroom floor. "Let's get you dressed, I think I hear mom in the kitchen."

It didn't take long for Liz to get her brother dressed. Right up until her sudden onset of hypertrophic puberty, she had made a regular habit of playing with dolls. At her current size, dressing her brother was no different than dressing Ken. That still didn't leave her any proper options for herself though, having grown to a size the humanity had never designed accommodations for. Not wanting to show up for breakfast as a statuesque reminder of her medical indecency, Liz did her best to tie her bed sheet around herself. She was fortunate that her parents bought her a full twin sized bed to replace her prior kid's bed, as the sheets were barely large enough to cover the vast expanses of her flesh. It didn't bother her too much though, as given the decision between having clothes and having her current body, she would have no qualms about choosing to stay as she was.

Having finished dressing, it was time to head downstairs for breakfast. Not wanting to risk slipping on the stairs while descending, Liz decided it would be better if Josh rode her downstairs piggyback style. They could smell the aroma of fresh coffee wafting up the stairs and hear the sizzling of hot oil, causing their stomachs to rumble in hunger in spite of the large protein shakes they both consumed.