Gwen puts you back on task.

"I have some serious training to do before the night is out, and since you three received yours early, you can help me." Gwen addresses you like a general commanding troops. You feel an overwhelming urge to please her smother your intense lust. However, the hunger bubbles menacingly below your calm demeanor, a promise for things to come.
"Now, we can't start our feeding frenzy right away. We need a plan. Luckily, I already have one." She says, a sharp fingernail fondling her chin absentmindedly. "As you know there is a managers meeting tonight. I've set this up, of course, to be the perfect situation for our needs. However!" She points at the three of you. "I can't do it without a little bit of help. And you three can't help if you stand out like that." She gestures to your naked bodies. "Come now, dress!" You groan in disappointment, but you start reaching for your discarded clothes anyway. Karen glances down at her ruined dress, then smirks mischievously at Gwen.
Gwen rolls her eyes; "Yes yes very clever. Now pull on that jacket and try not to stand too close to anyone." Karen pouts but does what she's told. Finally, you begin to follow Gwen out of the toilets and down the corridor.
"Alright, lovebirds you're going to stay by the door. You will not move from the door unless I tell you." A look of immense despair passes across their face and Alex tries to say something, until Gwen holds up a hand. "You will be by the door to stop any... unwilling participants. Anyone who approaches with intent to leave is yours to do with as you wish. And when the initial shock has died down, you may join the fray." This cheers the pair right up and they look to each other with a quick squeeze of palms.
"Now Linus, the first actual manager to receive his training, you will play an integral role." You turn a corner. The office is of course empty; all the staff either gone home or waiting for them in the meeting room.
"You will enter first, sit amongst your co-workers so that when I give the signal you will begin the training." You smile. This will be a good night indeed. You imagine taking Sarah, making her beg for your fangs before transforming her into the dark beauty you are sure she will be. You imagine how sweet her blood will taste, and how her cold cunt will feel on your member. Finally you arrive at the meeting room. The door is ever so slightly ajar and you can hear soft voices, chatting about nothing.
"Okay Linus, stick your head in and see if we have everyone present." Gwen says.
Trying your best to hide your new nature, you poke through the door and scan the room. No one notices you, or if they do they make no indication of it. All seems to be present except... Sarah. The one you ache for most is nowhere to be seen. You duck back out and inform your master. Gwen thinks for a moment, then smiles.
"I think there is a more... entertaining solution to this little problem. Alright Linus, go and sit, we will be in shortly."
You nod and enter the meeting room.