You were in Task Force 141; a special unit with mostly monsters and very few humans. One of the monsters was your Sergeant, Soap MacTavish. He was a werewolf, and seemingly proud of it.

You weren't. You were a shape-shifting creature. And you hid it for...personal reasons. It didn't matter. But, one night, you woke up to a pang of hunger in your chest. You often slept in your 'natural' form; the form you naturally wore when not disguised as a human. Ah, everyone was asleep, what was the point of hiding it?

You walked to the kitchen, sleepily looking around for a snack. Until, out of the corner of your eyes, you saw...Soap. Right there, seeing your true form.