Masturbating my BBW girlfriend

My girlfriend and I have shared many mutual masturbation sessions. She is a BBW, large woman with the kind of sexy fat body and pendulous breasts that I just love and an incredible capacity for orgasmic pleasure. She has a handjob technique that gives me GREAT orgasms! Watching a vid of her jerking me off, I saw that as her hand slides up my cock shaft, she releases her thumb and forefinger as she reaches my glans, gently brushing the corona as she does so. Her steady rhythm starts the buildup of orgasm with that wonderful tickling sensation in my balls which gradually builds to an explosive pleasure pulsing cum-drenching squirtgasm leaving me breathless! She is a master at this, kissing and nibbling my ears, neck and nipples as she brings me off. She loves watching my cum spurt! I have a way of bringing her off that I absolutely love doing. With my thumb and forefinger I pinch her outer lips until I can feel her excited little clitoris through her cuntlips. I do not pinch her clitoris, I pinch (gently, of course!) just above it so when I move my hand down I can down I can feel her clit against them. This puts pressure on the nerve bundle that runs from her clit down both sides of her genital area, sort of a wishbone shape. I occasionally give her clit a direct pinch through her cuntlips. I masturbate her this way in a manner similar to when I stroke my cock. There is no direct touching of her clitoris, just putting pressure on it through her cuntlips. Over the years that we have been lovers her ability to orgasm has increased exponentially. She has tremendous orgasms, some lasting a full minute or more. As I see her nipples become erect and her stomach muscles starting to ripple in the buildup to her orgasm, I time my clit stroking and pinching to them, sometimes giving her clit a squeeze between tummy ripples. When she goes over the edge she has absolutely explosive orgasms, losing all control, grunting, screaming and whimpering as her body shudders and her limbs move uncontrollably. At this point I increase the pressure on her clitoris and make rapid movements, this propels her into a level of orgasm where she can't even scream, she just makes little grunts thrashing her head from side to side as she shudders in extreme pleasure, pumping her ass and thrashing around. I have masturbated her in this manner while driving (in the country, not in traffic), reaching over and playing bringing her to a clit-pinching orgasm as she sits in the passenger seat and making her writhe with pleasure. Her orgasms are absolutely spectacular whether I bring her off with my fingers, tongue or cock!! She also enjoys masturbating herself to orgasm with one of her sex toys while I watch. She loves to have me see her being so naughty and pleasuring her own pussy. She likes verbal encouragement, things like "come on, dirty girl, show me how you like to play with your pussy. Fuck yourself with your pussy toy. Pump your sexy ass as you fuck yourself...show me how you like to cum..." and the like. Her usual toy is a rabbit vibrator (a present from me!). When she starts to orgasm I pinch her cuntlips and feel her clit, holding it where the rabbit is directly on it and she goes into supercharged orgasm. Often she will scream for me to cum on her face so I stroke my cock watching her in the throes of uncontrollable ecstasy and spray her face with my cum. When her orgasm subsides she lays their breathless, her chest heaving and her face splattered with my cum...a truly lovely sight!!