System Contracts Used Maliciously

So there's a particular NSFW series I've read (I judge me too) where the unsavory MC uses contracts enforced by the System with a modern human's understanding of contract law. Due to the rest of the civilized galaxy using System Contracts in very straightforward ways (contracts automatically enforced by System, they can simply say "Person X will not in any way harm PC" and the system will prevent Person X from taking actions that would harm the PC) to pull off trickery.

The afore-mentioned PC uses these contracts to do things like trick people into diving a dungeon without the ability to heal, or to force them into slavery.

Are there any less smutty stories that deal with MCs using Contracts in interesting ways?