Bra cups are relative to band size. For reference, a 36C is roughly the same volume as a 32E. These are call sister sizes.

I’m tired of guys saying ‘uwu G-cups’ without any context. A 30G is the same as a 42B. Start asking what their band size is ffs. It’s like saying 'she weighs 120’. 120 what? Bags of flour?

I will require further pictures of the g cup wearer to verify the veracity of this story