When he first entered the school, Mizukawa was Sakamoto's class homeroom teacher. But Sakamoto did not study well, causing him to be "repeated" year after year. Mizukawa had to tutor him privately but to no avail. And between the two there is a secret that cannot be told to anyone. Sakamoto has a big, strong, hard cock that Mizukawa can't stop thinking about. Her sexual desire is so great, she makes Sakamoto fuck her over and over again. Whether it's in the classroom, the bathroom or at his house... Mizukawa always wants to milk Sakamoto's sperm, wants him to fill her womb with sperm. Even right before the graduation exam, Mizukawa still did not forgive him, still wanted him to ejaculate all his sperm inside her. And all of Sakamoto's knowledge also followed the sperm flow into Mizukawa's pussy, causing him to "repeat" another year... The new school year has arrived, Sakamoto meets his homeroom teacher Mizukawa again. , signaling the start of his "hard" school year...