Sherlock felt an odd tingling behind him. When he looked back over his shoulder, he could see, and feel the aura around this man. He stopped and turned around, trying to figure out what was going on with this mortal.

Or was he?.

"What.... are you, John Watson?" He stepped closer to the man, staring at him, taking him all in, his look, his smell.

There was something.. powerful about this man, and it both interested and aroused Sherlock.