I don't remember if she actually said it before, but I always felt like Iofi was the type that wants Godzilla to stay big and monstrous (as opposed to any kind of shrinking or human form, even for the sake of sex)
Here she emphasizes that she likes seeing him stomp around cities, so I'm now more certain of her having a size kink.
https://www.youtube.com/watch?v=LYLHrcjrahg&t=2494s 