This is what I am currently playing, I love it when Mel sends a sexy picture to me and follows up with the "I already sent it to Ben as well", what a gorgeous slutty girlfriend
If I remember there is a specific choice with one of the pictures she sends you. You have to ask if you should send it to Ben as well and she will ask if she should send it herself or if she should communicate with Ben on her own or something along those lines. Just remember to ask Mel if you should send pictures to Ben as well and eventually you will get your wish.