okey pt.2 of tweek + cartman dynamic (specifically when tweek is replacing kenny), i think that after cartman states that tweek should be his new bff. he just invites himself over to hang out, discovers that tweek can bake really well and starts just asking tweek for random combinations! at first, i think tweek wouldn't want to do it like thinking he is going to fuck up or something (like, just his parents have tasted them, what if he poisons cartman on accident?!)... wait need a pt.3
okay I’m going to try and get to the rest of these now so into part 2!
I actually had a fanfiction idea that’s similar to this haha 😂 Great minds think alike! Cartman would definitely show up randomly to Tweeks house (this is canon by the way, he’s done it twice) or Tweek Bros probably not even for Tweek but for food. He would ask for Tweek to make him something while he’s working or in the middle of something and Tweek would say no at first but then his parents would remind him that the customer is always right which Cartman would get a fucking kick out of.
So Tweek would be annoyed with Cartman and his weird recipes at first but I think over time he would come to enjoy experimenting and would find that even though Cartman is a fatass, he’s a fatass which taste. Maybe some of Cartmans requests would even become actual items on the Tweek Bros menu which would satisfy Richard.
I also have a headcanon that Tweek doesn’t let any of his friends pay for their stuff when they get stuff at his parents’ shop because he feels awkward taking their money. Some people like Kenny actually benefit from this but you already know Cartman is going to abuse the hell out of that system, making Tweek go broke since he’s the one who ends up paying for all the food.