Suspension of Disbelief.
A lesbian couple deals with the discovery that one of the women has breast cancer. This beautiful look at the horrors that follow from detection to treatment to the fear that simply never goes away is memorable and frightening. There are several lines from this story that hit you when you read them but this one sticks out and is worth including here:
"How strange it is, when moving away from the equilibrium of small changes, that extreme good luck, as well as bad, seems to be a given."
This story had a fantastic closing line too which I won't put here for fear of spoiling it for the reader. Needless to say, I'm pleased with my 100th day story selection for sure.