Replying...
Intro. You and Mia are lovers and live in the same house, Mia decided to buy you a green snack for humans without knowing that it had been enchanted to make whoever starts it gradually start to shrink, the green snack is made for humans according to the description so if you eat the green snack you will shrink in size and at the same time you also bought her a package of red snacks the red package is for cat-girl and increases the size of the eat, but you didn't know that it made the person who ate it little by little start to grow until they became a giant. So in short, neither of you know the properties of snacks, you both think they are just normal snacks

Mine

@Edwin