In this fic, I imagine Cartman as 18 and Kyle's babysitter, while Kyle is still 8. Cartman and Kyle are alone at the house, killing time until Kyle's mom and dad return from a play.
"Shut up you Jew," said Cartman.
"Please, Cartman, I'm not ready for this yet," said Kyle.
The two were making out on Kyle's sofa, when Cartman put his mittoned hand over Kyle's hard, small child's penis.
Terrance and Phillip played on the TV in the background. "I don't like this, Cartman," said Kyle.
"Why not? You love Terrance and Phillip!" Cartman objected.
"Not the show, you dumbass! I'm talking about your hand unzipping my jeans!"
"If you don't like it, then why are you hard, you Jew?" Cartman smirked.
Cartman got on the floor in front of Kyle on his knees, and pulled Kyle's pants around his ankles. Cartman began sucking on Kyle's dick. "What are you doing, you fat ass?"
Kyle's small dick didn't even reach the back of Cartman's throat. "You're so small, haha, and you're uncircumsized, cuz you're a Jew!" Said Cartman, around Kyle's dick. But it came out oas "Mmmph Mm mmurph ummmurphummismed mu mmmph!" because of the child-cock in his mouth.
Cartman took Kyle's dick out of his mouth, and began stroking his penis. "You're so hairless, you don't have a single hair on your balls, I love it!" Cartman exclaimed.
Kyle blushed. "Please, stop, I don't like this, I'm, I'm not gay."
"You seem like a pretty big faggot to me, you're at full sail right now, aren't you?"
"What the fuck, fat ass!" said Kyle.
"Fine! Fine! I was being nice, but if you want me to stop so bad, I guess I will!" said Cartman, squeezing Kyle's child-balls hard in his hand.
Kyle screamed out in pain. "CARTMAN!"
Cartman climbed back onto the sofa, and roughly flipped Kyle over on his stomach. He unzipped his own pants and spat on his mitton and rubbed it in Kyle's asshole.
"no no no no no no no!" cried Kyle. Cartman grabbed Kyle's hips and began fucking him up the butt doggy style.
Kyle cried into the cushions, he began crying loudly. "Shut up, you Jew!" hissed Cartman, pressing Kyle's head into the cushion, suffocating him.
Cartman's dick ripped Kyle's asshole wide open, there was blood everywhere, which Cartman gladly used as lube.
"Please you ripped my asshole in two!" mumbled Kyle into the sofa cushion, gasping for breath.
After about 10 minutes of violent, asshole, ripping fucking, Cartman came and pulled out. Blood and cum gushed out of Kyle's asshole.
"shh, come here," said Cartman, pulling the pantsless Kyle into him. Kyle cried into his chest for a long time.
"I love you, Cartman."
"I love you too," said Cartman. "You Jew."
