The deadly kiss

Y/N is a villain that already tried everything to kill Cassian. Cassian is a hero when he tried to save the planet a building fell and in that building was the person Y/N loved and cared about the most-their sister-. Y/N tried to kill Cassian but they never revealed their identity. Now Y/N is at a bar to meet up with Cass. They try to seduce Cass and tries to get him to kiss him because just before the meeting Y/N put on poisonous lipgloss that will kill Cassian immediately.