Oppai | Succubus Academy

It sounds like you're referring to — likely a fan game, visual novel, or adult-themed RPG (often found on platforms like DLsite or in indie dev circles). The title combines oppai (Japanese for breasts) with succubus and academy setting, suggesting a lewd/comedy game where the player character navigates a school of seductive demonesses.

If you want a based on that premise, here's a lighthearted excerpt: Oppai Succubus Academy – Welcome Assembly oppai succubus academy

Lilyssa giggled. "Most don't."