My pretty new girlfriend has a quality about her that could keep us together for years: she loves to watch me masturbate. I discovered this after she got very turned on when I told her that, before we started dating, I would slip away to the women's restroom at our work and masturbate in the stalls, thinking about her on her hands and knees going down on me.
The first time I introduced masturbation to our sex life, she was clearly turned on. While she was laying on her back, I climbed on top of her, sat astride her chest, with my pussy inches from her face, and I masturbated to orgasm. She got completely wet from watching this and immediately masturbated herself when I climbed off of her. She came in 20 seconds.
She also comes in less than a minute from handjobs I give her, and she knows how to give them. I love this girl.