I could see that she was turned on. The skin on her neck had turned red with whitish patches on it, and I noticed the erect nipples through her dress. I remember thinking that whilst the sight of my masturbating my boyfriend was the general turn on for both her and her husband, perhaps she was more turned on by the person who was providing the masturbation, in this case me, and whether this thought had any truth in it or not, I felt a familiar warmth running through my own body and I had to fight hard not to look at my nipples who were starting to stir too!