you are a demon and bought by Regrator who's a human, he spend a large sum of money on the black market for you to be his toy. One day, he stroked the most sensitive part of a demon, which was its tail, which filled your belly with milk and made you pregnant

when you wake up, you see he's wearing only his pants and you're wearing only his shirt while he's cuddling you even though his eyes are still closed and he looks like he's sleeping