Yes! You leap forward and pull Alex from the poor woman.

You grab Alex by the shoulder and yank him back. He flies back past you, far too easily you think briefly before the next sight sweeps your last thought away. Karen's underwear is nowhere to be seen and a small amount of red liquid oozes out from her vulva. Despite this shocking sight, she seems to be okay. There is no wound on her neck that you can see, which means the blood is Alex's perhaps. You also note that she seems fitter and, you cringe even as you think this, sexier than ever. But before you have time to process this information you spin around to face Alex. Sure enough he stands in the centre of the room, the neon light overhead casting stark shadows over his muscular chest. He cleans his fingers before crossing his arms and grinning at you broadly. His canines seem impossibly sharp and his skin is just as pale as Karen's. He is also in as much a state of undress as her; his semi erect penis lolls out of his partially pulled down trousers.
"What the fuck Alex!" You yell, one hand moving towards the phone in your pocket as slow as you can. "Were you- Were you... **** her?! Your girlfriend?"
Alex only grins as a sharp sound breaks the silence; the sound of heels on tile. From the shadows emerges another figure.
"My Linus aren't you brave." You squint at the figure's face as she enters the light.
"Gwen? Is that you?" The sight of your line manager surprises you. Gwen had gone on some retreat in Italy for a month, no contact with the outside world allowed. He hadn't heard she was back. Back and, inciting her employees to ****?!
"What's going on Gwen..." You say, managing to keep the fear from your voice.
She steps fully into the light, a taloned hand wrapped around Alex's waist. She is wearing an impossibly tight black skirt which ends just above the knees. Below, her smooth, perfect legs are covered by netted stockings, and fashionable Italian high-heeled boots in leather. Above that she wears a cream leather jacket, which clings tightly to her curvy torso. Its fastened up one side with a zip and the collar rides high, obscuring anything that might be underneath. Her lips are painted a deep blood red, and her eyes seem to glow a tawny amber. Her hair sits perfectly as if it was cut and styled only moments ago, the brunette locks cut short, but still with a little bob. This sight surprises you as Gwen was a notoriously bad dresser. But the realisation is quickly filed away in the unimportant part of your memory as she begins to speak.
"Well, as I'm sure you are aware, our company has come under new ownership. And, as a result, new management methods are required. I caught these two being a little..." She strokes one finger along Alex's penis, which instantly becomes erect. "...Naughty, and saw fit to administer an appropriate punishment."
"Wha- What?" You mutter dumbly.
Gwen rolls her eyes and sighs. "Clearly not a horror fan." She strokes Alex's chest, then very deliberately licks her sharp teeth. "I gave Alex here a little nip, and then when his... retraining was complete, I told him to give Karen a lesson as well." She looks at you expectantly.
"You- You're vampires!" You say as you accept the impossible truth.
"Bravo!" Gwen cries, and she and Alex laugh melodically.
"Don't come any closer." You say as menacingly as you can, holding up your fists.
"Oh honey," Gwen smiles. "We don't have to."
Behind you you hear a slight rustle as a pair of hands slip around your waist and you feel Karen's breasts press into your back. Her chin rests on your shoulder as you shiver from the cold of her body.
Her breath chills your ear as she says; "Hey Linus. I always did dream of you in my arms like this. Well, with maybe a few less clothes and a little more moaning."