Over the course of all the Harry Potter films, the love story between Harry Potter and Ginny Weasley is very slow to develop. But, once those two get together, there's no stopping them. This becomes quite clear when they're put in a life-or-death situation and seemingly can't get their hands off each other for a while.
In Harry Potter and the Deathly Hallows: Part 2, things get scary during the Battle of Hogwarts. Voldemort and his dark army have invaded the school campus, and students and teachers alike are left fleeing for their lives. But, of course, Harry and his friends prepare to fight back, to take back the Wizarding world from the dark side. So, when Harry and Ginny see each other before they have to go their separate ways, not knowing if the other will return alive or not, they share a kiss that is equal parts passionate and just plain hot. Seriously, it was about time those two got some sizzle, and with that kiss, it was evident.