The beginning of the end was in January, a few weeks after Tom and I had done it while Bobby was visiting. I was still working my lousy secretarial job, and Tom was still doing whatever it was he did (I was sure he hated it as much as I hated mine) but now there was the unmistaken understanding between us that we were both getting something out of the arrangement. It was never stated outright beyond a few harsh exclamations when we fucked, but we were enjoying our agreement. I liked the money, naturally, but we'd been at it for so long that a few things were clear, most...