Raven's tightening spurred him to apply a little of his inhuman strength.  Over 120 years of existence had taught him how much he could use without hurting a human partner, though in his darker moments that wasn't always a consideration.   But he pushes harder, letting her get a taste of the fact she is with someone more than human. He growled, low and primal, as his demon tried to claim her with his body.  At the moment, with his blood in her, she smelled like something that should be his.