Marinette and Adrien are paired for their class Secret Santa exchange, but the simple gifts set in motion something much larger and more complete than either of them alone.

Everyone knew that if you had a soulmate, you would know them by the first time you touched. Skin-to-skin contact would show you all of your soulmate's memories, and would result in an immediate bond and intense fidelity. ----- Soulmates AU illustrated fanfiction