With a sparkling reputation in patent litigation, San Francisco’s Keker & Van Nest chooses its cases carefully, wins often, and has clients who follow its marching orders — at least most of the time.

But its recent efforts to defend a small-time adult business that tries to put a little sensation into cybersex ended with hurt feelings all around — and a protracted fight to get off the case entirely. Keker argues irreconcilable differences, its client says it’s all about greed, and one of L.A.’s leading porn lawyers is caught in the middle.