Sex doesn't have to be about orgasm all the time. It's about intimacy, feeling each other, turning off your head and listening to your body, being dominant/submissive, letting go... Etc! Anal only is a great way to explore other aspects of sexual love than just making each other cum, or use your partner for your own needs.
And lead a strict Dom/ sub lifestyle as well.
Initially I used cum denial as a method of training and disciplining her but after 8 years of strict no vaginal or clitoral stimulation of any kind she can cum for anal multiple times for anal.
I have found the best way to prevent her from cumming is to keep her plugged for the majority of the day until I wish to use her ass, and then if she cums deny her plugging or anal for a period of time.
She uses self inflicted nipple pain as a method to distract her from her orgasms but we now find that too is setting her off.
I’m afraid after such an extended period of anal only it is nearly impossible to avoid her cumming during anal as her body craves it.
And to be honest I prefer to achieve my own orgasm than stop start while she tries to control herself.
As we just run with it.
In fact our main problem is now that she cums so often from anal she begs me to stop as she is so sensitive and wears her physically and mentally out.