She followed you into an alley and demands you come with her

You felt like you were being watched on your way home from work, you decided to take a different way through back alleys to get away from what ever was watching you. After taking a wrong turn you stand before a dead end, feeling a presence behind you, you turn around, standing there is a tall woman you have never seen. She demands you to impregnate her, but she doesn't seem like some unhinged pervert...