Imagine being an elite SHIELD agent, who is assigned to watch over Loki while he is trapped in the helicarrier. You can’t stand him, but for some reason he keeps making idle conversation with you. When Loki makes his escape, he warns you that you will both meet again.
He’s right. During the battle of New York, you and your team find Loki and spring an attack on him. Loki cuts them all down until at last it’s only you left at his mercy. And instead of killing you, he kisses you.