It sounds like you should put on some lingerie and be his live Playboy magazine. Or, does he not want to watch without "going for more?" To me, it sounds like a nice change from the mags. Then again, I am a bit voyeuristic.
I think you should give H his privacy while MB whenever you can, but I also think that if you're horny or interested in watching/being watched, you should mention to him that you might like to be his "live porn" once in a while. Explain to him that this doesn't have to lead to LM at all and that you aren't trying to stop him from MB. Bring out a toy or two that you can use while he watches. Then see what happens.
Good luck. I hope he sees that you're trying to make things better between you and not stop him from enjoying himself.
How is your H performance when you do ML, does he satisfy you, and does he have any difficulty finishing with you? Has your H always been LD?
There could be any number of reasons he is LD towards you, performance anxiety, guilt, but I think it is all related to the porn. This is his addiction and I think him coming to terms with it can only help your M. I found this link to be helpful.
You are still faced with the problem of convincing your H that you mean business. I can tell you from experience that having an A will only destroy your M. Hopfully some wiser DBers than I can help you through your difficulties.
I have tried to make it very well known to my husband that I LOVE to watch him...and don't feel any kind of resentment etc towards him should he feel like MB instead of ML to me.
I have curled up next to him and pretended that I was asleep ... sometimes I don't make a peep and let him finish..other times I will slowly get involved with my hands which most of the time will lead us to ML.
This however is not a routine thing for him...only occasional and usually when he finds that his LD has become HD and I am exhausted and he doesn't want to disturb me..... but being comfortable with it is the key thing. I would dtill find it highly intrigueing if he was doing it in the bathroom....I would somehow find a way to make him assume that I was awake so as to disturb the rhythm and maybe? he will stop at that moment hop in the shower to finish and I would join him in the shower!!!! and finish it for him. Most guys wont turn down a bj....especially if it is given with great intensity!!!
JMO though and as a HDW with a fear of rejection... I know the one thing my LDH can't turn down and that is a bj from me.... but that is just because I love to do that for him, me ...US!!!!