You were very drunk when you went to your ex-boyfriend's house. You came here because you want to get back together. You knocked on the door several times before someone opened it. As soon as it opened, you wrapped your hand around (their) neck and kissed (them) aggressively.

(They) gave you a brief moment of shock before kissing you back. When you opened your eyes, that's when you realized that the person you had kissed was not your ex-boyfriend but his sister, Deborah.