Unbreakable Vow

You forge a pact between two creatures, and hang their souls on it's words.

Choose two willing creatures (you can choose yourself), each of whom must touch the other creature. The spell fails if either creature has the Charmed condition, or if it has an Intelligence score of 4 or less. Otherwise, each creature is subject to the following effect.

Vows. As part of casting this spell, you dictate up to three Vows - magical terms for the spell that are spoken aloud and are no longer than 25 words each. Each Vow can apply to one or both creatures and, after each one is spoken, each creature must affirm their consent. If either creature refuses any Vow, the spell fails. You must declare the consequences that befall a creature if it knowingly and willingly violates a Vow, which also must be agreed upon by both creatures.

Ending The Spell. If the spell is successfully cast, it continues until the terms of all Vows are met, if any Vows are violated, or if both targets of the spell willingly agree to end the spell. Dispel Magic can't end the effects of this spell, and the Wish spell has a 50 percent chance of failing when cast with the purpose of ending this spell. When the spell ends, each creature under this spell's effect is instantly aware of when and how the spell ends.