Sound! Recommendations for a perverted life

The main character, who entered Seishi University, majored in the Department of Metamorphosis in order to deepen his understanding of metamorphosis and learn knowledge, and eventually to conduct research. In order to have the opportunity to come into contact with perverts more closely, I decided to stay at the Maezono family in Manko City, which is famous as a charismatic perverted family. The Maezono family is a family of five, including a mother and four sisters. All of them are hardcore perverts.