Come out tonight - Richard Laymon

It's a hot, hot night.
Too hot to be making love unless your romance is young, like Sherry and Duane's.
It's their first time but there's just one problem - they have no condoms.
Of course they could wait until tomorrow... Duane remembers the all-night Speed-D-Mart.
In the usual circumstances, it's not a place anyone would want to visit at night.
But these aren't usual circumstances.
Duane throws on his clothes - the store is just ten minutes down the block. Now Sherry is waiting. Ten minutes has gone, so has twenty.
She's not worried - what's another few minutes? Then she hears the noise from down the street.
It might be a door slamming.
It might be the backfire of a car.
But Sherry thinks it sounds mostly like a gunshot...