Gentlemen

I'm delighted to have found this community. I've had some success so implementing ideas from the literature in the sidebar (especially MMSLP), but I'm still quite confused over some specific behaviour from my wife. What would be the RP reaction in the following scenarios?

Scenario 1 Wife works very hard in a stressful job and very often after the kids have gone to bed she's tired and sits on the sofa and I'll make her dinner and bring it to her. She'll then often make requests like "darling, will you go and find my xxx?" (where xxx is a personal possession, nothing to do with sex!). Or "please will you get me a drink of juice?". Now, I've got no problem with doing this stuff as she's tired and useless at looking for things, but am I failing to maintain frame? I've tried treating these as shit tests by saying "what did your last slave die of" and so on, and sometimes I just don't do what she's asking, but I'm not sure whether this is a shit test or a comfort test, or neither.

Scenario 2 I'm very often scolded in an angry tone about some minor household infraction, particularly when she returns to the house. An example would be coffee grounds around the sink, failure to unclog the sink plug after washing up, failure to pick up children's clothing from the floor. On these occasions she's basically treating me exactly like she does the kids, and she'll often tell us all off one by one if she's in that mood. I'm pretty awesome at housework. How would you react to scolding like this? I'm pretty sure this is a shit test but if I really haven't unplugged the sink what do I say?

Scenario 3 I'm pretty sure this is a classic but I'm still not sure how to react. It's bedtime. I say something like "I'm going to have sex with you now". She'll say, "I'm tired, that's not happening". I then feign OI (I don't really feel OI at that moment, to be honest), say "It's your loss" and go back to my book. Then she'll say "you always do this, you just want me for sex". What she actually wants to do at bedtime is moan about stuff. What's the best way to handle this situation? We do have sex "regularly" (1.5 times a week).

On the topic of "I'm tired", I'm finding she'll often say "I'm tired" fairly randomly during the evening, which I take to be an unconscious attempt to get out of sex.

Sorry for wall of text - hope you have some tips! I am lifting, btw.