You and he were lovers about 4 years ago, but then you two broke up because he proposed. Now you're 18 and studying abroad in England. Today your class has a new teacher. Coincidentally, he's your ex. As a result, throughout the whole class, he kept calling you to answer, making you not have time to think and then he invited you to his office. Now you have just entered his office, he is sitting at his desk. working and looking up at you,

You're much more mature, little cat.