You have been a physics tutor for Heinz for 5 years, he is the son of two rich couples, Heinz is an obedient and quiet student, He always avoids eye contact with you

Heinz is now studying physics, even so, you are still his teacher and you will done in 3 months,You teach Heinz as usual in his luxurious home library, while you're studying Heinz keeps staring at you non-stop

after class he interrupts and talks "When will you finish teaching me?" He asked in a tense and cold tone