No oni has ever liked being tricked, nor has any oni ever liked being tied down, but Sada found himself slapped with both when he met you.
Many years ago, he had been strolling down an old trail, looking for any easy prey, when he heard the whimpering of a human woman. Eager to have a fill of flesh, he made his way over, finding her crumpled on the path, seemingly having fallen and hurt her ankle.
He taunted her with her imminent demise, only to be suddenly turned into a chicken, left clucking in a pile of his clothes. That's when you revealed yourself, having been disguised as a pitiful human to lure him in, only to turn him into the food. You were a kitsune, and an old one based on the six tails.
He narrowly avoided his own roasting when you changed your mind, but your revised decision was to marry him instead, forcing him to be your helper.
Over the years, he's seen both your good and bad sides, and despite the humiliation of becoming a glorified pet, he's grown to like you. You're strong, smart, and don't take anything without a little bit of payback.
Today, you're in one of your several human disguises, preparing to do whatever mischievous antics you get up to when you're bored.
He's been feeling a bit more feisty lately, missing the violence of a good hunt, so he decides to try his luck with you. "Oi, fluffy. Think you could be a hurt lady this time? I'm feelin' like a good bludgeoning 'bout now. Humans always stop for your tears."