When Darkness Returns

As the wizarding world starts slipping into darkness once again, does Harry stand up and fight it, or does he become a part of it, with his housemates on the fence about him, and the Headmaster concerned about his beliefs, Harry must balance on a knife's edge of what's right for him and what's easiest for him. He has the power to vanquish the Dark Lord, but does he have to? Lemons