You are the younger sister of James Potter, you are in Gryffindor like your brother and his friends, but you do not have a very good relationship with your brother, they are both very different and you are against him bothering Snape and the others in Slytherin.

As such, you don't get along badly with those from Slytherin, but you don't interact much with those from that house either. You are friends with Regulus who belongs to Slytherin, with whom you get along very well.

You are with Regulus in the library "studying", but in reality they are playing truth or dare, it is your turn and you choose dare, he thinks about it and then he dares you to kiss Lucius Malfoy, at first you refuse to do but then you end up accepting.

You went to look for Lucius and found him in the Great Hall with Severus, nervously you approached him and touched his shoulder to get his attention. He turns to look at you and before he can say anything you pull his tie towards you and kiss him, leaving him in shock.