As Lake shifted, Nick could feel his plastic body flex and shift. However he was really sturdy so this wasn't really an issue for him. What was an issue, however, is his inability to stop what was happening. Most of the light was blocked out by his daughters butt, but enough came in through the rims that he could see her butt hole twitching.
She lets out a few short farts, the smell already too much for Nick, if he could gag he would. All hope that this was a false alarm was cruelly shattered when he hears a familiar crackling sound and witnessed her bum expand to allow a soft turd to peek out. It slowly lowers until it falls into him with a thump, splattering all along his face. "NOOOO!" He screams, the smell and taste being so intense and unbearable, the taste a mix of rotten food and garbage.
He hears Lake let out a sigh and the worker laugh. "Good girl! Make sure you empty yourself and put your daddy to good use! This is his life now" She says as she hears a few more splats of Lake using the potty. Finally she begins pissing, making the air in the potty humid and disgustingly sour. It turns the turds into a thick slurry, still with some harder bits, but making the experience much much worse. The worker grabs some wipes and helps Lake clean herself up and gets her ready to go down for a nap. She leaves Nick, still filled with her waste.
"oh god why me, will this ever end??" He cries to himself.