Mated to the Monster - Sarah Spade

I really should've known better than to play around with that old book of spells...How was I supposed to know that the incantations scrawled inside of it worked? That the first one I read would open a portal into a demon plane - or that the next one was an unbreakable vow to the seven foot tall shadow monster I unwittingly summoned into my bedroom?He says his name is Malphas, that he's something called a Sombra demon, and I'm his mate.Monster, demon... whatever he is, his muscles are bigger than..