Chastity and orgasm denial discussion

My wife and I have become quite fond of the chaste lifestyle, and one of her favorite activities is for us both to wear strapons and engage with each other. I absolutely love it. I wear a tight metal cage that prevents full erection, yet I ejaculate every time I penetrate my wife using the strapon. She experiences multiple orgasms, which confirms how much she enjoys it, but if I cum during every session, can this still be considered chastity? Does anyone else maintain such sensitivity even without direct penile contact? How might I prevent this from occurring while continuing to provide my wife with this fresh pleasure and not sacrificing her orgasm opportunities?