You take her for yourself.

You remember that you always wanted to fuck a goth chick, and besides, you're curious about where else she might be pierced. You approach, and place a hand gently on her shoulder, the other already undoing and removing your belt. You are vaguely aware of movement around you as Alex, Clarice and Karen move to their respective volunteers. Eve turns towards you. There is a smile on her face and excitement in her eyes, but you also detect more than a hint of fear and uncertainty. Good, you think. You put your hands on her waist and move in for a deep kiss. Then, you take her by surprise by moving your hands up to the back seam of her dress and ripping it from her curvy form in one motion. She gasps, but bites her lip. Her breasts are large and heavy, held in place by a lacy black bra. Her thin waist and large buttocks give her a perfect hourglass, but you think she could stand to lose a few pounds. Sure enough, her belly button has a silver piercing peeking out of it.
She looks at you and says: "Do you li-?" You interrupt her by putting a thumb in her mouth. You find yourself touching her wet tongue piercing, which gives you an idea.
"No talking." You say sternly. "Looks like I'll have to gag that mouth." Your other hand on her shoulder, you push her down so her face is level with your crotch. With one hand still holding onto her mouth, and your eyes locked with hers, you undo you pants and drop them to the floor. Your large, pale penis folds out, already erect and up for fun. You see her shake slightly, but her arousal is obvious. You let go of her mouth and slide your member in. She gags and chokes but you make it all the way to the back.
"Now." You say. "Show me what you can do with that thing." She begins to move back and forward, the metal bauble grazing your cock. While it is arousing, it all feels too tame. You glare down at her.
"Harder!" You push her jaw together in way that would be painful for any other man, but brings only more pleasure to you. With her piercing pressed tightly into your cock the friction is far greater and as such the stimulation far more exciting. She gags and chokes, sometimes reaching up to push you away, only to be stopped by your heavy glare. Eventually, you come, sending a healthy load down her throat. You pull free, shooting your final dregs onto her cheek. She coughs and doubles over, spitting your cum on the floor. Before she has time to recover, you grab under her armpits and lift her into a nearby chair. She looks at you. Now the fear is very real in her face, but her arousal is undeniable. You smile as cruelly as you can as you pull her bra from her chest with one finger. Her tits are large, but without the bra struggle to keep their shape. Still, they are a magnificent pair, their beauty exacerbated by the wicked looking black spikes pierced through each nipple. You massage each one, enjoying their feeling under your finger tips. Her underboob is slick with sweat, and you can feel her heart beating very fast. You trail a finger down her navel to her crotch. Then, gently, with both hands, you reveal her moist cunt, to see what you hoped to see: A beaded ring pierced right through her clitoris. You look up at her and smile broadly. She smiles back at you but is still clearly very nervous. You lean forward, still making eye contact with her, and kiss her clit, taking the metal in your mouth and tugging ever so slightly. She moans and tries to close her legs but your hands prevent her. You lift up and brush away the small tears that have appeared in her eyes.
"You are so beautiful." You say and you mean it. "But you will be more beautiful still Evelyn." The tears are flooding her face now, you are unsure whether through joy or regret. You lean in and kiss her sweetly, both hands clasped around her jaw, and at the same time you enter her. She gasps and pulls away from your kiss. The piercing is pressed into your penis and as you begin to thrust it pleasures you both. Evelyn arches her neck back.
"Do it." She says. You smile. Gently but firmly you pierce her skin and drink her sweet blood. She grips the chair, the cocktail of pleasure and pain driving her to madness. You move down to her breast and bite deeply over her nipple, your tongue working her piercing frantically. She shudders and comes with a series of whimpers and moans as the last of her lifeblood is taken from her and her head lolls back. But still you persist your thrusting efforts even as her body lies still. You admire her change as her buttocks reduce to a more manageable weight and her waist tightens and gains muscle. Her breasts become firm and perky, but are still soft to the touch of your tongue. Suddenly she bucks against you, wrapping her strong legs around you, thrusting up onto you as vigorously as you thrust into her. You look up and she grins back at you. Her mouth now displays a set of sharp fangs set in perfect contrast to her black lips. Her eyes are no longer dull brown but deep crimson, like your own. But the best change of all is her expression; gone is her hurt, scared eyes and tears. Instead she looks at you with a devilish smile and eyes filled with insatiable lust and want.
"Fuck. Me. Hard." She says. You roar with laughter, and practically lift her with your member as you take her from the chair and smash her against the wall. Her arms wrap around your neck and her legs pull you in even tighter as you pound her against the wall. Had you done this before you would have broken her spine in seconds, but now she gives as good as she gets, grinding against you, her breasts bucking and swaying to your erotic rhythm. You come with a gasp and pull her in close as orgasm shudders through the both of you. Eventually, you let go of her and she lands gracefully on the ground. She puts two fingers to her slit and pushes them apart, giving you a perfect view of your seed oozing from her vagina. You look up at her and she blows you a kiss. You turn around to see what your other compatriots have been up to. Clarice is snuggling and kissing a stunning dark skinned vampire (who you remember is called Theresa), clearly having finished their fun together. Karen and Alex have Beth (a red head with perfect curls and cute freckles) sandwiched between them and are taking it in turns to kiss her plump lips. Their bizarre game has the three of them in fits of laughter. Apart from your fellow vampires the room is deserted. You look to Gwen, who stands from her perch.
"I must say you do yourselves credit." She says. Her clothes seem untouched, but you are sure you can see a slight damp patch in her panties.
"As you can see I let the others go." You feel Evelyn embrace you from behind as the rest of the vampires come to attention for their master. "Now, the real fun begins." She smiles wide and laughs, and you can't help but laugh along with her.