Writing shit I've done in class

Extension to 'The Veld(t)' by Ray Bradbury

At the moment in my English class we're doing creative writing so I'll probably post some of my creative challenges here. Every time I tried to copy and paste the story into here my browser crashed so if you'd like you can search it up on Google for free. It also gets pretty gross and morbid at the end but it was to mainly freak the fuck out of my teacher. I wrote everything except for the first line.

"A cup of tea?" Asked Wendy in the silence.
"Yes please, that would be nice." McClean smiled, following the children out of the nursery and down the hall towards the kitchen.
"What are we going to do?" Peter whispered to Wendy, making sure the adult behind them couldn't hear.
"What do you mean?" Wendy replied.
"Father turned off the house, we can't get the drinks machine to get him a drink." Peter clenched his fists at his side in frustration.
"We'll just figure it out." Wendy shrugged.
"I have no clue how to use the kettle! I was terrified to learn after that one time Mother spilled her drink and got that horrible burn on her hand..." He sighed in exasperation.
"It wasn't that bad! I'll go ahead and figure out where everything is!" Wendy chirped before skipping ahead of the other two. When Peter and David reached the kitchen they saw Wendy hard at work, attempting to make the drink. Peter suggested that David should relax in the lounge room, then joined Wendy in making the tea.
"I've figured out the water! But I'm too small to reach the tea bags..." She frowned cutely, pointing to the top cupboard. Peter climbed onto the counter and retrieved the box of tea bags from their place. He sat the box on the opposite counter, letting Wendy take out and put one of the bags in the mug. "Should we put cream in?" Wendy asked and Peter pondered for a short while.
"No, Mr. McClean seems like someone who'd have his tea bitter..."
"What makes you say that?" Wendy became intrigued with her older brother's statement.
"He just does... But he's taking us away from here, we can't let him do this!" A look of determination wiped across his face. "I have an idea..." He walked over to the unused sink and opened the cabinet below, revealing several cleaning supplies.
"W-what are you doing? We're not supposed to go in there, Mother and Father said so..." Wendy bit her lip worriedly.
"They're gone, we can do whatever we want." Peter reached in and took out a big bottle, who's colour was that of a hospitals walls, clean and sterile, and presented it to his sister. "How about we put a little bit of this in his tea, it shouldn't hurt. We'll probably just scare him off... Right?"
"I think so, it'll just make his tummy feel a little bit weird from what I know..." Wendy furrowed her brows and thought of what she had been told in the past, but before she could fully think the plan through her brother was already pouring the contents of the bottle into the mug. The colour of this liquid was strange, like milk, but as if it had been mixed with water. It also smelled weird too. Like the smell that their school uniforms had after they'd been washed, and every mark would've been removed from their pristine white shirts. Whatever it was they both silently agreed that it was good enough for their plan of teaching Mr. McClean a lesson. They both entered the lounge room, where Mr. McClean was perched on the edge of one of the many chairs.
"I see you've made me my tea, did you parents teach you?" He asked, smiling at the two of them.
"Yes!" Wendy beamed, showing her rows of perfect, sparkling white teeth.
"This smells so good!" He took the cup from Wendy's hands before taking a sip and giving the cup of tea a face of uncertainty, but changed it before the two very innocent looking children could notice. "Mm, yum!" He sat the drink down onto the table next to him, showing no more interest in it.
"We didn't put any cream in it, is that why it tastes bad?" Peter pouted, accusing the man of disliking the drink that he and his sister had worked so hard to prepare.
"Oh! No no no!" He picked the cup back up. "I usually have my tea with milk, it was just a little bit too strong, but don't worry! I'll finish it anyways!" He lifted the cup to his lips, hesitating for a second before taking a swig, trying to finish it as fast as he could to get the torture over and done with. After a couple of seconds, he turned his head towards the children who were staring at him before choking out. "What did you children put in here?!" Then he lurched forward in his chair, spilling his guts out onto the carpet. After a couple minutes of doing so he stopped, and fell forward into his mess of blood and vomit, leaving the clueless children to stare at his lifeless body.