OPPAI Succubus Academy Sucky and Busty, Demonic and Lusty!Steam + DLC by Milk Factory - Adult Sex Game

OPPAI Succubus Academy is a VISUAL NOVEL set in Faren'ch Deshka Girls' Academy. Its students may excel in bust size, but their ero ranking has the academy on the verge of closure. It's up to Suguru and his Book of Sexy Magic to get all the succubi, teach them his ero ways, and save the day!
Formally known as "More! Knock Me Up! A Super Ero-Succubus Academy in the Parallel World of Fiery Boobs!"