21: Midnight
The first time Stiles slept over after Scott had been turned was the night of a full moon, and Scott was terrified. He had already tried to kill Stiles on more than one occasion, and didn't know what would stop him from doing again.
But Stiles insisted, practically shoving his way into the McCall house, carrying a bag and his pillow.
They stayed up late playing video games and talking, just like old times, and when the clock read midnight and the full moon shone, Scott wondered how he could be out of control enough to kill his best friend.