Breast envy is a trope I enjoy in anime.

15 Lustful Anime Girls Who Are Completely Boy Crazy

Why Anime's Female Body Envy Trope and Bust Size Jokes Need to Stop

DISC] Question! - ch.3 : r/manga

Anime & Manga / A Cup Angst - TV Tropes

When flat chest Girl Get's Jealous of Big B00b$ Girl's in anime

Mysterious Girlfriend X (Manga) - TV Tropes

Monster Musume (Manga) - TV Tropes

14 Anime Girls With Undeniable Breast Envy

Even the Girls Want Her - TV Tropes

Breast Envy Know Your Meme

Bust-Contrast Duo - TV Tropes

Jon Del Arroz on Passive Anime Protagonists - deus ex magical girl