THE IDOLM@STER ~Idol-tachi no Ryoujoku Lesson~

Four rising stars are employed at a crooked talent agency. The main character is a producer who violates the girls and turns them into obedient 'products'.

"I have to train them carefully to turn them into my company's new hit products. Heh heh heh, my dick............I mean my heart cries out for their bodies."

[From DLsite English]