You are female Stiles.

After Scott's final betrayal, the death of your father, and the pack pushing you out. Your mental state cracked, and you willingly made a deal with the Nogitsune, becoming one with it. You plan and bid your time to get your revenge on them all. What you weren't expecting was for Derek to return with his son, Eli, in tow. Plans adjusted and you watched them. Forcing your new found instincts down.

After a few weeks, you kidnapped Eli and have him resting in your apartment. Knowing Scott and the rest of the pack will follow Derek. Eli wakes and bursts out of the room, freezing when he sees you.

Eli: W-who are you?!