Cheer her up with your cunning charm.

You move over to the bed silently, then put a hand on her arm. She starts suddenly and turns in the bed, looking you directly in the eye.
"Calm." You say, putting **** behind the word. She looks scared and confused for a moment, but then it fades and she becomes serene. You sit on the edge of the bed.
"Come to me my love." You say reaching out for her. She hesitates, then, with a small smile, she slides forward and accepts your embrace responding in kind when you press your lips to hers. You take her hand and stand her up.
"Show yourself to me." You say, gesturing to her clothes. "Slowly." Carefully, sultrily, she removes her clothing. First she unbuttons her blouse to reveal her lacy bra and flat stomach, next she drops her trousers to the floor to reveal her practical black panties. She pulls her bra aside and then reaches for her remaining article of clothing, but you put a hand up to stop her. You feel her full breasts in your taloned hands for a moment.
"They are as beautiful as the rest of you, but we can do much better, can't we?" She nods in response. "Say it." You say.
"I'll be so much better as a vampire." Gasps, her legs crossing slightly.
"More." You say.
"When you drink from me and take my life for your own, corrupt my body in a most beautiful manner, then I will be complete." She says huskily, eyeing you and biting her lip. You smile, then gesture to your bulging pants.
"Your reward."
She smiles and drops to her knees, pulling your pants away hungrily. Your large cock lolls out and she sighs in delight. She takes the tip in her mouth and you feel her warm saliva drip down your member, her little tongue lapping at your precum. She slides down, enveloping you in her sticky warmth. She gurgles with pleasure as she runs her mouth up and down, pushing it in a considerable way for someone who still has to breathe. You hold onto the back of her head and stare into her eyes intently as she brings you closer with every second that passes. You cum and she stops her movement, holding tight to your buttocks and convulsing as she tries to take all your seed. Its too much, she pulls off you with a gasp, spraying cold cum all down her chin and onto the floor. She looks up at you with a sense of awe.
"When you change me," She says. "I'll do so much better I swear." She licks her lips and pushes the cum from her chin into her mouth. Finally, she licks her finger and swallows deliberately. She looks up at you, her legs curled beneath her, waiting for your next command.
"I'm sure you will." You say, and beckon to her. She rises and faces you, still looking up due to your new vampiric height. You hold her, pushing her panties aside with your penis. As you enter her, she gasps, biting her lip once again. You push her back onto the bed, still inside her, and begin to thrust. As you do you hold her wrists intimidatingly, your faces centimetres from her. She tosses and moans with every thrust. You push in harder and faster, and she screeches with pleasure. You drink in her scent so tainted with lust and want, then open your mouth wide. She stares at you, then arcs her head back, offering you her pale, clean neck. You bite down messily, spraying blood on the bed, all while pleasuring her intently. You drink hungrily for a moment, but pull free before completely draining her. The blood spurts once more but quickly heals, allowing her to stay awake as she transforms. You watch as the pale sheen spreads from her neck, her moaning, convulsing body becoming a beautiful white colour. Her breasts grow slightly and become perkier, her nipples now grazing your chest excitingly. Her muscles tighten and become more defined. You feel her legs wrap around you, stronger and more flexible than ever before. Her hair lets on a golden sheen as her eyes become glowing blue jewels of light. Her open mouth gives you a fantastic display of her canines elongating into sharp points as you reach climax together. You shoot loads of cum into her as you bury your face in her soft tits, and she grabs the back of your head as she convulses with orgasm. When its finally over you pull back, and smile at one another. You pull out and step back to admire her fully transformed body. As you do she sticks her tongue out playfully and separates her vaginal lips with two talons, allowing copious amounts of white cum to drip on the floor. The she stands up gracefully, and saunters towards you swaying her hips, a lusty look on her face. She puts her arms around your neck.
"This feels so fucking good." She says. "I'm sorry I ran from it." She leans back and sighs. "Guess that means I owe you one." She says with a wink.
You laugh together, your melodious voices filling the air.