I echo your statement, and I would also add that even if he wasn't doing NoFap, it still wouldn't be fair to assume he's okay with that and not respect his boundaries. Men who watch porn and masturbate are still allowed to have boundaries as well. But it sounds like this situation was resolved well with the wife, so that's good.
That's some shady shit going on under the hood if you ask me. An anomalie in a dynamic (assuming that that's what it is in your Arrangement) would've served me as a warning. Have your eyes wide open.
I would say to you're wife that you find it inappropriate that she walks topless around you're house (you don't have to mention that you get a hard on by her or thinx about her boobs) just say you found it inappropriate and that she might talk to her about this situation. isn't a bad thing to say actually its pretty normal to ask. I pretty sure you're wife would ask the same thing to you if you had a gay friend who walked naked around the house
And yet here you are on website because you have a sex addiction...just like the next guy. Hypocrite much? Eh, I just call's em like I see's em.