Midori excitedly opened the package she had received. She set it up in the bathroom along with a few other things, then finished her work for the day while waiting. Meanwhile, Charles read the text he received saying to ensure his bladder was full and to possibly hear her use words he might not like. Charles texted back saying he could agree to that since it was her turn that day, but this coupled with her warning of some infantilism had him curious about what was in store.
"I'm home, Nidoqueen," Charles said as he returned. "What are we...?" He blinked, stunned at the sight before him. Midori was wearing DIY lingerie (meaning she had made strategic cuts in some underwear she already owned) and had made another set for him. "Can I at least shower first?"
"You can shower when we're done," Midori said, kissing him. "For now, just put that on and meet me in the bathroom." She touched his bladder. "Good boy. Midori likes that you followed directions."
Charles put on what she had instructed him to wear. He was a fairly skinny guy, and she had some slight, though noticeable curves, but he was always a bit surprised that her underwear generally fit him well enough. After pulling his penis through the slit in the panties, he met her in the bathroom, seeing that a training urinal had been mounted on the toilet and a pair of handcuffs was on the shower curtain rod.
"I initially wanted to do a student and teacher thing, but one aspect was missing, so that'll be another time," she said. "Today, we're going to be doing a bit of potty training."
"I'm doing this for you," Charles said.
"Midori appreciates that Charles is doing this for her." She pressed on his bladder. "Good and full. I like that. Do you know what it means when your bladder is full?"
"It means Charles has to go pee pee," Charles said, internally dying a bit, but feeling his heart rate increase a touch.
"And how do boys go pee pee?" Midori asked, batting at his slightly hardening penis.
"With our...boy pissers." Now Charles really wanted to die, but simultaneously, he had to admit there was something he enjoyed about childish words filtered through Midori's accent. "If Charles has to go pee pee, he has to point his boy pisser where he wants it to go."
"Guess what?" Midori said, putting Charles's hand on her bladder. "Midori also has to go pee pee. Does Charles know how girls go pee pee?"
"With their...(fuck) girl pissers. Girl pissers fold in instead of sticking out, so girls have to sit when they go pee pee."
"It's best for them to sit," Midori said. "We can stand up, too." She brought his hand down lower and let him diddle her clit. "If Midori sat to go pee pee, she'd get bored. And she'd have to wipe, since her spout is inside the folds and the pee pee makes it all wet. But if she stands, Midori has to open her folds, and her pee pee goes out."
"Rainbow," Charles said.
"About to burst?" Midori asked.
"No, just need a minute to think like an adult."
"Well, don't take too long, because I'm ready to explode."
"Uh huh." Charles was about to burst (he'd gone once before going to work, and never since then), so he decided to endure it a bit longer. "Purple."