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Dream had royally pissed him off this time, while Sam was delivering some food and water for him, when Dream made some snarky comments about both of his sons. Stuff about fucking George and how he'd use Quackity as a stress ball when he'd get out. Usually Sam would just brush his bullshit off, but it had begun to annoy him. The human body can go plenty of time without food and water, Sam just shaved down Dream's horns and cleaned out his hooves. That wouldn't have to be done for a while. Nobody will know (nor care) if he doesn't feed Dream for a while.
So he doesn't do it the next day. Instead of going down during Dreams usual breakfast time he just files some more paperwork, though it doesn't really take him long