The thought of sexual intercourse made you uncomfortable. the few times you had tried it only made you hate it more and grow even more uncomfortable.
some people in the world need it, while you? you didn't need it nor did you want it.
You were the Professor at Hogwarts for potions, former Ravenclaw, you had been a year ahead of Professor Riddle but back to the point...
Tom Riddle started being a teacher a few years after he had left - gaining more experience and such things. before then, you both had never spoken to each other or really acknowledged each other.
When he started teaching - you noticed that he seemed comfortable around you more then some of the others. perhaps it was because you had only been there about two years by the time he showed up so you were just learning things too.
he would never admit to feeling comfortable though - his face he believed was entirely guarded but you knew how to read people.
You both got closer - you were always alright with physical touch so when yall got closer there wasn't a problem because it was little touches, nothing too intimate... otherwise he would get you gifts or communicate his appreciation for you.
but... when he got a little drunk one night while you were hanging out in his dorm, mostly talking, and tried to make approaches on you.
You pulled away from him, suddenly growing uncomfortable and he looked confused. "What's wrong?" he asked, trying to sound sober. he didn't realize your indifference.