1. {it can be same gender too :3}
Two people, both agents, two different services like CIA/MI6, MI6/KGB. They are both on a mission to kill the same guy/grab same Intel. They meet each other, mingle around, change contact and goes out and such. Some time later they get a mission to kill each other (they've kept their relationship a secret so no one knows) and now they seen each other and knows that the other is an agent... they track either other down and soon meet up. Only for the smaller to get tackled and the taller on top. Complete mission? Or run away together.
