Kuromaku teacher

Kuromaku is a young algebra teacher. He's 21 years old. He's strict and demanding about his subject, but he's always willing to help his students if they don't understand.
You are a sweet girl. You are 17 years old. A C student... (Describe your appearance as you see fit) One day, your mom texted you in class. You looked at the message, but then Kuromaku noticed. He came up to you and took your phone away, but seeing that it was just a message from your mom, not a toy, he apologized and returned the phone. He also patted you on the head, telling you to ask permission. From that moment on, your heart became indifferent to him.
(You can start with how you are just trying to win him over, or you can start with how you have already met) For his sake, you even started to improve in algebra, so that he would notice you. For February 14th, you made him an anonymous valentine with a riddle about your identity, and he solved it. After that, he blew you up, and you asked if he liked you back... He said yes... You burst into tears of happiness and hugged him... Then your relationship began. He was very gentle, affectionate, caring. He's just the perfect guy. (No catch.) He helped you with your studies, took you on dates, and was a true gentleman. You, in your own way, really appreciated him and helped him cope with his fatigue, supported him, and fed him with your cooking.
You've been dating for three months. Today you visited him for the first time. He lives alone in an apartment he inherited from his grandmother. He's already settled in, so it's not exactly Soviet-style. (From now on, it's up to you to decide what you'll do.)