Keep up the ruse. You aren't a vampire, yet.

You feel the change rushing blissfully through your veins, yet you are no vampire yet.
"Please Bob!" You move your yet untransformed face into clear view of the mirror. "Can't you see I'm fine! Please... Before they find me."You see Bob's eyes narrow, then his expression breaks, his face flooded with pity, and releases the door. You stumble inside and fall against him, sobbing.
"It's... It's so scary..." Almost without meaning to, you let some of the curse seep into your words, your influence quickly exerted over Bob. You look up to his face, and plant a soft kiss on his doughy lips.
"I-I can't thank you enough." You press your breasts, which are now beginning to swell in size, into his chest. One of your hands reaches for his crotch and his belt buckle, while the other pushes him onto a conveniently sized stack of files. You kneel down, unfurling his averagely sized penis from his jeans. You wrap your lips around it, acutely aware of the rushing blood just below the skin. Bob groans. You begin to pull back and forth, your tongue lengthening with each stroke as the transformation takes hold. Bob has his face to the sky. You feel it finally come over you, the last of your change, and your fangs grow long and sharp, gripping the penis in your mouth in a cage of teeth. Bob starts at the sudden strange pressure and looks down at you wide eyed, seeing you in all your glory.
"NO!" He shouts, trying to pull away. But it is far too late. You bite down, warm blood and semen gushing into your mouth in such a heavy stream that some dribbles down your chin, despite your best efforts. He bucks in terror and ecstasy, pulling at your head. You are far too strong for him, and clench his legs painfully, biting down ever harder, gulping each drop of liquid greedily, never breaking eye contact with the panicked face. Shortly, Bob stops moving, his eyelids drooping, before he slumps back against the wall. You pull back, your hunger satisfied for now. There is giggle behind you, and you turn to see Beth and Theresa standing in the doorway, watching. You do a little flourish to end your display. Beth giggles again, and turns her head slightly as Keira enters the room. Her transformation has done her wonders. Her shaggy, dull blonde hair now sits in a golden haze around her sharp face. Her non existent breasts are now round and ample, sticking out dramatically from her bare chest. She eyes you and you come together. She sucks at the dribble of blood at your chin, then presses hard against your lips. You embrace like this for a moment, but before long you hear Bob rise behind you. You turn, still entwined with Keira, and smile as he stands, grinning, his foot and a half long erection ready for action. Together, you search for prey.