Fatal mix-up! How could THAT happen to me?

I am totally HAPPY at the moment! I've had a boyfriend for about a month now and he's super great! Well, when it comes to sex he could be a bit more intense and persistent! His family is nice and his twin brother (apart from the undressing looks) is also quite nice. The two differ only in one small detail, a birthmark on his left foot. Now I've given my sweetheart the key to my flat so that he can come straight to me in the evening after work. I wanted to surprise him with a romantic bath, candlelight and hot sex so that he could relax after a stressful day! But something was different and in the end I was in for a shock! I don't know how this could have happened to me! If you had done something like that to me???? I would never have thought that something like that was even possible!