The aunt who will captivate us

I am currently a second-year prep school student. I tried to pass the exam on my own, but ended up failing, so I moved to Tokyo and ended up living in a boarding house. At this boarding house, there is an unspoken rule that only those chosen by the admin Aunt Michika can participate in special late-night training. Only those who participated can understand the contents of the course, but just imagining that it would be a course alone with the busty Aunt Michika, would make me feel like I'm going to get a nosebleed. However, on the first day of the boarding house, I heard moans from the room where the lesson was being held, despite my imagination.