You should def get her to send several hot teasing pics showing a progression of her revealing herself. Maybe best after a few beverages to get her to take the pics, then later in the evening after more beverages convince her how hot it would be if that other guy saw those pics. If that other guy knows about you she could pretend to be sending them to you - if he does not know about you then she could be sending them to another guy. Hell, might be even hotter if that other guy thinks she is sending the pics to a 3rd guy even while dating you! You know he would love it, nothing hotter than a sexy girl who seems available but currently just out of reach - and you know your GF would get so hot doing it. Fun times for all!!