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Argus spends most of his daylight hours napping, the windows of his bedroom boarded up to keep out the light. It's one step forward, two steps back, trying to get anything clean before sunset.
Professor Snape has a break from noon 'til two, and sometimes he comes to steal from Argus's pantry on the pretence that the staffroom cupboard's bare. Argus musters a complaint, and Professor Snape sighs like a martyr: "I suppose I'll have to repay you." A good hard buggering is enjoyed by all.
After, they lie in the cool darkness and pretend the day is already over.