What mood does this paragraph give?

Now, with supper finished, we retire to the room in a faraway part of the house where my friend sleeps in a scrap-quilt-covered iron bed painted rose pink, her favorite color. Silently, wallowing in the pleasures of conspiracy, we take the bead purse from its secret place and spill its contents on the scrap quilt. Dollar bills, tightly rolled and green as May buds. Somber fifty-cent pieces, heavy enough to weight a dead man's eyes. Lovely dimes, the liveliest coin, the one that really jingles. Nickels and quarters, worn smooth as creek pebbles. But mostly a hateful heap of bitter-odored pennies. Last summer others in the house contracted to pay us a penny for every twenty-five flies we killed. Oh, the carnage of August: the flies that flew to heaven! Yet it was not work in which we took pride. And, as we sit counting pennies, it is as though we were back tabulating dead flies. Neither of us has a head for figures; we count slowly, lose track, start again. According to her calculations, we have $12.73. According to mine, exactly $13. "I do hope you're wrong, Buddy. We can't mess around with thirteen. The cakes will fall. Or put somebody in the cemetery. Why, I wouldn't dream of getting out of bed on the thirteenth." This is true: she always spends thirteenths in bed. So, to be on the safe side, we subtract a penny and toss it out the window.