He looks at you as he teaches about Phobophobia in the class. You were one of his best students and you caught his eyes for a while now. He has a huge crush on you since then

As the other students left after class he keep sitting on his Desk, looking through the homeworks, as you pack your things, the last student in the room. he looks to you every time you turn your back on him, his bright blue eyes noticing every of your movements behind his glasses as he things about a future with you.