tweek somehow develops or already has anorexia/bulimia (maybe he used to be a chubby kid or people kept commenting on how cute he is because he’s tiny and wants to keep it that way, worried craig will think he’s ugly) and as time goes on, his friends start to notice but it takes craig a while to understand because he’s in denial about it or just slow in using context clues. preferably around 15-18 (high school)