Carla ate another bite of sandwich. She looked up the term in the context of the story.
'Sandwich - when three people make love with one in the middle, usually of the opposite gender from the outside pair.'
Fingers tightened. A dollop of mayonnaise oozed from the middle. "Oops, someone just came." She laughed, fingering a gingerbread cookie in the shape of a person. She bit one leg off. "Neat."