Maybe he was going to clean anyway and she likes having an excuse to give head.
Still not sure what the trap could be.. he cleans and she doesn’t blow him?
I thought the trap was (only because I’ve heard about it before) that if he doesn’t clean, he won’t get the blowjob and he’ll have a grumpy wife, whereas if he does, chances are that she might get angry at him because he only does things for his own pleasure and she might use that as a reason to not do it (I know it sounds petty but this is just something I heard about?)
Still not sure what the trap could be.. he cleans and she doesn’t blow him?