"Head to the Astronomy Tower."

Harry whispers the words as he walks by, confident that the bustling crowd would drown them from the ears of any but his intended target. It appears to have worked perfectly as they exit the Great Hall along with the rest of the Ravenclaw students, Luna quickly distancing herself from the pack as she takes a right where she should be going left.

He'd had to think on his feet but he was sure the Astronomy Tower was the perfect spot; it was secluded, a far distance from any normal prefect or professor patrols, and guaranteed to be empty at this time of night.

Confident that the spell was working as intended, Harry also split off from the pack, taking a different route in case anyone had witnessed the interaction he'd just had. A quick glance down at the Marauder's Map as he neared his target confirmed that the Tower was empty aside from a single dot - the words "Luna Lovegood" hovering over them.