He'd promised Holly that he'd give Lucy and Jack his undivided attention while he had them on his two week summer visitation, but he had shit on a stick on the Washington Heights homicide and if he didn't talk to his CI by the end of the week he might as well just throw in any chance of solving the damn case. So he left them sullenly stewing in the car while he dashed into the precinct and quickly snagged a few files from his desk, and was halfway back out the door before he heard the moans coming from the copy room; he backtracked, cocked his head, and smiled slowly when he recognized the voices. So that's what Joe and Connie meant by "working late."