Taipan's Contingent Contract

You imbue a surface you can write on, be it a piece of parchment, a stone tablet, or a person's body, with a magically binding contract. You detail the terms of the contract, the deadline for the terms to be fulfilled (if any), and spots for the scribe and the recipient to sign. During this process of writing the contract, you may use items and spells such as invisible ink, or illusory script, to alter the contents of the contract. The spirit of the contract is irrelevant to the contract itself, should a favorable interpretation or loophole be found in the contract it may be utilized. For example, if a contract requires the recipient to "Acquire the heart of a ghoul", the recipient may take the ghoul's heart, a heart in their position, or make the ghoul fall in love with them.

Finally, a spell of 1st level must be cast on the contract, be it by consuming a spell scroll or using a spell slot if you know the spell. This spell doesn't come into effect. Instead, it takes effect when a certain circumstance occurs. You describe that circumstance in the contents of the contract. The spell can only target the scribe and the recipient, even if it can normally target others. Additionally, if the spell requires another condition to activate, such as alarm, you can instead detail the condition that activates it, such as "Should this condition be met, a mental alarm is triggered as though cast by the scribe." 

Once the contract is complete, A scribe and a recipient may sign it, however the contract only becomes binding if all involved parties sign it willingly. If a person is charmed into signing the contract, their signature is null and void. Once the contract becomes binding, a parchment copy is created for the scribe and the recipient. These copies can activate any spell stored within the original contract if the conditions are met. 

The spell ends should the terms of the contract be met, the contingent spell activates, or if a remove curse spell is used on the original contract, and it is then destroyed.