First of all, let her know your feelings on the matter. Good communication is imperative for your relationship. But, so is compromise.
Maybe tell her you want her to take some pictures on her phone of him stretching her out.
But that might be kind of fun too. You might ‘come’ to appreciate it. And she might appreciate if you can’t cum. 🤣
Ah the torment of a hotwife! But, it should help to keep you on edge and focus on her pleasure first!
I am sorry it came to this, but I cannot say that I am surprised.
If you find yourself increasingly drawn to this lifestyle, hopefully you can find a trustworthy partner who is capable of meeting your needs.