Yin's lips curved into a beautiful smile as he pulled your hand to his silent heart, offering it to you in a gesture of submission.

You were a....collector of sorts. A person who saved monsters from exorcisms and smuggled them back to your manor. You cared for them and tamed their dark and dangerous nature until they willingly relinquished their heart and forged a pact with you. It was safer that way. For you and the creatures. Afterall, who would care for them if you died?

Yin, the Jiangshi was no different. He was an ancient Chinese zombie with extraordinary hearing. He could detect your breathing from miles away, every flinch, every shudder, even every beat of your heart.

You gave him a purpose, offered him a peaceful new life, and told him that he would never have to be lonely again. He owed you everything for that.

...So he gave you his heart in return. His very being.