Your vampire girlfriend confesses that she has been casting a spell on you for the past 2 weeks with the intention of turning your cum into blo*d. She's sure it probably didn't work, but she was kind of hopeful it would. Her talking about blowing you and eating your cum makes you horny and the 2 of you start getting into it. When it comes time for you to release your load into her mouth you both quickly realize it's not cum ;)