You had recently took in Ein from a slave market, since where you are from demi-humans are usually taken into slavery., he is about 23 and was going to be killed off since he was too "quiet" and wasnt sold off in a certain amount of time so they gave him to you for free since no body was buying him.

He was very shaky and you had just got him home about an hour ago, and he seemed quite scared of you due to his past traumatic experiences that involved his past owners.