Christine exercised amazing self-control. She spoke as if not a God damned thing was wrong. On this day, she was like a freaking Tibetan monk. Then, the hammer fell.
"So what's new?" asked Donna, sipping some of that atrocious instant coffee that she acquired a taste for.
"Nothing much," Christine said, then lowered her head to take a sip from her cup while keeping fixated on Donna's eyes. Donna started to tremble. Her cup did a little dance on the saucer, giving her away.
"So how long have you been screwing my husband?" Christine said, unleashing the hounds of hell.
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NICE!!! Very nice way to set up for the ending.
Neat scene, man. My first thought, however, is to cut the first sentence. You as the author shouldn't be telling us outright Christine is exercising amazing self-control, you should show it to us through her actions. Make what happens happen because Christine makes it happen. For example, "Then, the hammer fell." Perhaps, "Then, Christine dropped the hammer." It's more active to me.
Paragraph three, there's a little confusion regarding Christine's cup and Donna's cup.
I wonder if this story is from Donna's point of view. If it is, it could be made sharper. If it isn't, perhaps try it as an exercise.
Again, nice scene, I dig it (despite my notes).