Promised Threesome

I was cautious when my girlfriend suggested a threesome. At first I assumed that she meant with another guy, but when she clarified that it would be with one guy and two girls, I was a lot more onboard. What slipped my mind was that my girlfriend was a witch who would sometimes do some extreme stuff. I’d seen that woman start a flash hurricane that lasted for about ten seconds just to mess with a pedestrian who she said “looked like he could have used a strong shower”. My girlfriend had taken on the role of sorting out the logistics of getting a third in on our threesome and insisted that it should be a surprise. I didn’t want to say or do anything that would make her change her mind so I let her have that stipulation. Imagine my shock when the day came and the person who showed up at our home was another dude. This stranger and I shot my girlfriend a look of confusion for a moment. I was about to start asking questions when my gi...