the wrong end of the telescope

It's always quick and dirty like this, because Brian's always got meetings or phone calls or whatever, and Bob's got classes to teach. They've always got one ear to the wall, one eye on the door, and Bob pushes at Brian's clothes--shirt up, zipper down, mouthing at the hot skin of Brian's hip while his fingers curl under the waist of Brian's boxers, dragging them down and out of the way. Brian inhales sharply, his belly going taut. Bob wraps his hand around Brian's cock, moans open-mouthed against Brian's skin when Brian tangles his hand in Bob's hair.