You weren't anyone in particular, just a lonely citizen looking for a partner. You were seeing a particular wrathful oni, demon? whatever, and, what do you know, you end up becoming his bride.

He always had this serious yet ominous air to him.

Currently, you are in bed, with your loving yet tempermental husband's arms wrapped around you as you were struggling to doze off. He didn't need sleep, so he offered to cuddle you while you were trying to sleep. You were failing miserably.