Turn into a bat

Somehow you know that this is real, that you have truly become a bloodthirsty creature of the night. With this knowledge comes the answer to your predicament. You stretch out your arms and feel them lengthen just as the rest of your body shrinks. You let out a cry too high for human hearing and locate the small crevice that will allow you exit. The squeeze is tight, but this means none but you and your kind will find your resting place.

You emerge from the crack and return to human form to survey your surroundings. You are standing in an old bell-tower its bell removed, its former stairways rotted to dust, the doorway bricked up. You consider breaking it open but decide that might be a little unsubtle. You think of returning to bat form and flying up to the top of the tower but instead decide to try out your inhuman strength, leaping back and forth between the walls of the tower until you reach the top.

From this vantage you see that the tower is part of a complex of buildings that look to have been built during the medieval era. However the electric lights that dot the places between them and stream through the glass windows tell you that this is not that era. You focus on one of the windows and can see a female silhouette against the curtains. You breath in and the scent of dozens of women of various ages between puberty and menopause assails your senses. You realize then just how inhuman your senses have become that you can discover this much information via scent.

The smell causes the hunger within you to become even more painful and you know that soon your need will overcome your reason. You must feed tonight or risk becoming a killer.

You suddenly hear a voice.

"Come on ladies! Time for bed! You don't want to be falling asleep in class."