She walked in and caught him masturbating to online porn. She'd known that he'd been looking at porn online; he wasn't very good at clearing off the search history on her computer. Intellectually, she knew that all guys look at porn at some point, but emotionally, it made her feel insecure. WHy was he looking at other men's wives? Why not her? Was she not enough?
Her feelings were mixed. One of her biggest turn-ons was watching him touch himself. She also loved to make him cum and to watch him shoot it. That was one thing she couldn't do as a woman, and it always her a thrill to see his globs of white semen shootout.
So when she caught him, she stepped up and gave him a hand.