Sarah awoke to an uncomfortable nudge. “Argh, quit kicking!”

“I’m not!” Stephen, her younger brother, replied groggily.

“Yeah-huh! I felt it on my stomach!”

“They took apart all our leg joints, how could I have kicked you?”

“Well SOME part of you moved!”

Stephen snapped, “You’ve been wiggling around this whole time, and I never complained!”

“Nuh-uh! I’ve been staying totally still!”

“Tell that to your stomach! It keeps twitching and scrunching up, like a big gross caterpillar!”

“H-hey, you know I can’t control everything!” Sarah’s face grew red, though thankfully it was pitch dark inside the suitcase. She added, more boldly, “Besides, your… thing keeps twitching too, and it’s touching my face!”

Now it was Stephen’s turn to turn red. “Believe me, if I could move it somewhere else, I could. I don’t get why they needed to take it off, it’s not even that—“ he stopped himself, but it was too late. He didn’t need to see the grin forming on his sister’s face.

“Yeah, it’s so small, it probably doesn’t even factor into their ‘optimal packing’ algoma-rithm anyway!”

“O-oh yeah? I was surprised they were even able to slice your boobs off. I could swear they were gonna get blown away like sheets of paper.”

“Grrr… well how do you like THIS?”

Suddenly a bolt of pain shot through Stephen’s body, centered on where he felt his groin should have been.

“AAAARGH! WHAT THE HELL, SIS?”

“Hey, I just flicked something that felt like yours.” Given the reaction it had elicited, she probed it further with her detached hand. When it realization dawned, even she winced.

“Quit fondling my balls, you perv! Or I’ll do… THIS!”

“Ouugh” came the subdued response. Followed by a jet of water spraying Stephen in the face. Warm, acrid-smelling water.

“Crap… that was my bladder” said Sarah forlornly as the lone organ discharged its contents, the torrent washing over seemingly every body part within their oblong prison.

Stephen, undeterred, wriggled his hand in search of a body part that wouldn’t retaliate with humiliation. It felt like he’d entered a warm cavity, which he traversed with his fingers until he finally found a hold. His sister was strangely quiet, though it seemed as though her breath was hitching. Finally, he found a handhold and clamped his fingers shut. As he did so, one of his fingers slipped through some sort of hole.

Sara screamed. Once she caught her breath, she managed, “Q-quit fondling my pussy, you… perv….”

Mortified, Stephen opened his hand. His middle finger was still wedged through the opening, but the geography was starting to make sense, whether he wanted it to or not. His hand had taken the place of her uterus, entering her severed abdomen from above. His attempts to “swim” his hand back out were in vain, and provided further unwanted stimulation to both siblings. Now there was kicking, from all sides, as her various joints and truncated limbs wriggled in vain.

Stephen’s penis had rolled between a pair of his sister’s parts, which he could only imagine were a thigh and a breast; the continued motion had engorged his member so that the space it occupied was far from negligible. Moreover, his involuntary movements due to the stimulation complemented his sister’s, driving hers in turn, until they formed a sort of harmonic oscillator, disrupting each other’s fragmented privates, causing their scattered parts to contract, expand, push, pull…

They both screamed in unison, and a few more fluids began their complicated journey through the maze of body parts.

Stephen felt his penis shrink, and Sarah felt her left breast settle into newly formed groove between parts she was too spent to identify. The shifting of their more sensual body parts caused bouts of belated stimulation as things returned to equilibrium.

“They’re gonna see this, you know,” said Stephen, his eyes growing heavy.

“Why couldn’t we get… separate suitcases… like mom and dad…” complained Sarah as she drifted off.

They slept soundly for the remainder of the trip.