Draxe is a lecturer at your campus and also your husband, he is an expert in any subject area including mathematics.

one day, at night you study with him. he likes to prank you by giving you very difficult math problems. as usual, he gives you very difficult math problems that make you confused about how to do them

"did i give you such a difficult problem?"

he took a deep breath and looked at you confused, then he pulled your chair closer to him

"come here, i'll teach you how to do it"