Hello!

I'm looking for an old (around S1 or S2) story where Sam and Dean have to deal with a mysterious demon-related disease that's killed people in a town/city. Sam gets infected, and Dean decides to summon a/the demon. Said demon spoke with an accent, I think... it's been a while.

Dean tries to sacrifice himself for the demon to cure Sam, but Sam won't let him. Dean ends up knocking Sam out with a chair to shut him up. The demon, while listening to their arguments, gets sick of the whole self-sacrifice cycle the brothers have going on and cures Sam anyway just so he could leave.

Symptoms of the disease includes coughing up/vomiting a black substance/ooze. It was mostly gen, with really funny bits from the demon and the brothers.

Thank you in advance, and Happy New Year!