Part of me is inclined to agree just to set a precedent that we can introduce more transitions into the equation with little to no ill repercussions. But the other half of me is not sympathetic to her desire to have more frequent contact with her illicit "friend" -- on that I say tough cookies! (I have been celibate for 392 days now -- and she can't go for a simple 9-day stretch?!?)
Why should you agree to help her out and lose your night as well? I think the only way I would agree to that, unless it's something you really want, is if you don't have to give up a night? Then if she really really wants a break you won't have lost anything? Maybe I'm looking at that wrong though, but that's how it looks to me. Plus, I agree it looks to me like your W wants that, but is trying to make it look like she is doing you a favor. She sounds manipulative, and I would want to say no just b/c of that, but if she will agree to do it without taking away your night, then I guess it would be a win-win for both of you? Karen