His human wasn't a stupid man. But he certainly was when it came to Rowan. Not many could hear their lover was a demon and continue things. Much less after said demon had, on more than one occasion, legitimately been a danger to you. Having said demons obsession certainly shouldn't delight and warm any sane person.
Letting a creature like Rowan wield a knife around Raimundo at all should put the human on guard, much less around his most intimate areas. But no His Human for better or worse truly would let Rowan do anything to him.
He was grinning with a glint that made the monster he was shine at the forefront. Every scrape of the knife, every bite of pain or drop of blood made the both of them hungrier.
The move to flip the knife had been an impulse but with Rai the demon allowed himself to be more impulsive. His grin grew wider, more crazed, as he pushed the handle inside of the human. "That's my good Toy, taking it so well," the hilt was hardly nothing but he had bigger blades with longer or thicker handles.... Something to consider. "So desperate for your Master. If you can't have my cock you'll take anything of mine won't you? It's pathetic."