And Harry ... Harry had a pretty fantastic view from the top of the Astronomy Tower. The Marauder's map was a godsend. For weeks now, they had used it to track Blaise Zabini's every move. Ron had studied the pattern of when, where and who. About the how they had remained blessedly oblivious. Hermione had helped him perfect the spell that could concentrate and enhance residual sexual energy. It had been quite a revelation how much energy filling Hogwart's corridors. Harry had noticed that Blaise visited the Astronomy tower at least once every other week. Sometimes every week. Sometimes two times a week, depending on how "hungry" he was. Until now the Slytherin had always retreated to the dungeons at night. But after ten days of starvation, Harry felt that the "grace period" was over. Severus had thought so too but had been at a loss of how to help. There were no potions to satisfy a sex demon.