大きな胸が好きです (Ōkina mune ga suki desu).

The term is frequently used in the context of Japanese media and adult entertainment:

Certain Japanese gravure idols and models are specifically known for being "busty," such as Hitomi (known for having a J-cup) or Momoka Mihara .

The term is a common category in Japanese AV (Adult Video) and adult music tracks found on platforms like Apple Music . Demographics and Fashion

If you're interested in how to say "I like big breasts" in Japanese, the phrase is: