Answer by Anon User:
Definitely not strange or unnatural. Preference in breast size varies with time and culture.
When I was a kid I found my grandfather’s stash of 1930’s porn, including a number of issues of Snappy Magazine. It was a monthly periodical of erotic stories and illustrations. One of the recurring themes was the hero throwing over his big-breasted babushka from from old country for some waspy gamine. Having grown-up with Playboy’s barbie dolls, I was surprised to realize that they weren’t always what stoked men’s fantasies.
Also, google the art work of Enoch Bolles. He was a pin-up illustrator for Snappy and other pulp magazines in the 20s and 30s. You won’t find anything bigger than a C cup in any of his work.