First, withhold intimacy for two weeks. Your husband will be on a "sex fast", he'll be thrilled by the prospect of 'getting some', which is when you make your offer.
"Okay honey. We can have sex tonight if you do the washing or mow the lawn (or whatever if might be that you want him to do)."
Your man will immediately agree and get the chore done.
When he comes around to "collect" his reward, tell him that the office is closed and he will have to come back tomorrow.
Vox Popoli on this "joke":
Now, despite the lame foundation there is a way to make it at least vaguely humorous. You see, the next morning, when our lingerie-clad princess-protagonist asks her long-suffering husband why he is so unaccountably relaxed about her failure to deliver on the promised erotic acrobatics the evening before, he shrugs and replies laconically.
"I was sorry to hear that your office was closed, but fortunately your sister's offers 24-7 delivery."