Dean has every right to kick his ass to the curb for everything, for the way he'd been acting, for being that stubborn and that stupid. God knows that Dad had when push had come to shove (and to blows). Slowly Sam levers himself up. He has to hold the glass with two hands to keep from spilling anything.

"Okay."

He starts with small sips, forcing down every one until the glass is empty. The shower is another matter, but between the spell driving him and sheer Winchester-grade stubbornness, Sam makes it there and back again. By the time Dean returns he's back in bed, pale and shivering.