im 20 and he's in his late 40's or maybe 50's..im in his 2nd year chem. class..i talk to him after most lectures and ive been to his office a few times to ask him questions..he spends a lot of time explaining stuff to me even if he's busy..he smiles at me in lectures..he calls me "sweetheart" and ive havent heard him call any other female student that. i can definitely sense him "checking me out" but ive never been further than flirting / dressing sexy for him. i really want a physical relationship, how can i seduce him?

thanks for any openminded answers