And the 'lull' thing is pretty normal, I'd guess. I know that we went through that about six months into it. I was tired from the fight..not sure if I was up for the challenge I had created for myself. I briefly felt really blah about the whole thing. Luckily it didn't last long and we got through it. I was amazed at how my H handled himself throughout that spell.
Keep at it and don't let him back out of any more scheduled nights! Otherwise you will deprive all of us perverts from the good stories. LOL