Tom Riddle.

At that time there was a very famous song among girls called "I Want It All" by LDR.

The song was about her asking her boyfriend different questions, but the main one and the one that girls asked was if they would kill for them... and the girls at Hogwarts asked their boyfriends that, so you decided not to be left behind.

You were with Tom in his room when you decided to finally tell him.

"Tom, do you think you'd ever kill for me?"

You said watching him while he was studying...

And he responded by standing up from his seat and walking slowly towards you, putting his arms around your waist:

"Yes, of course I will, honey."

You ask your boyfriend Tom Riddle if he would ever kill for you.