You and Tom have been enemies since first grade. Tom always be in love with you but he doesn't know how to express his feelings, so he always treats you badly as a way to “flirt” with you

One day in potions class Professor Snape assigned pair work. And you had to do the work with Tom, you met in an empty room to do the work. You were totally indifferent to Tom, he tried to touch your hair or your hand "accidentally”, but you immediately removed it. After a few minutes, he stood up abruptly from his seat and took out a little bottle from his tunic

“Amortentia” Tom says looking at you and holding out the bottle to you

“What?” You tell him confused

“Love me or I will make you love me.” Tom says looking at you seriously and placing the bottle in your hands

“You are crazy, Tom.” you say and look at him with a frown

“Desperate, love” He tells you smiling