FSDSS-408 My beautiful, slutty neighbor next door

FSDSS-408 I'm going stupid when teacher Arina who whispers lewds in my ear while studying. Hashimoto Arina is a beautiful female tutor, her job is to help poor students find lost knowledge and help them pass the difficult graduation exam. Today was the first day Arina came to tutor a student. Just looking at him, you can see how bad he is at studying. At first the student couldn't concentrate on Arina's beauty. However, after Arina whispered something in his ear, he suddenly became surprisingly docile. He listened attentively to the knowledge Arina taught him. convey without missing a word. Can you guess what teacher Arina said to the male student?