It doesn't take long.

With your sharply heightened senses, you track her down in minutes. Her smell is sweet with sweat and fear. The two of you hardly have to run. She is walking quickly down a dirt path, trying to reach the town as fast as possible.
"Keira!" You call as you saunter up behind her. You hear her shriek and turn, her face a mask of terror. "Come Keira, I don't bite, much!" You laugh as Linus grabs her from behind.
"No! No Sarah we were friends! You're not like this..." She whimpers.
"Wrong and wrong Keira, we are still friends and I am VERY much like this." You approach, tracing her pretty chin with a talon. "And because we are friends, you will be like this soon too." As Keira whimpers you drink in her sweet scent, shedding your remaining clothing to reveal your full form. You eye Linus and he smiles, you are most certainly thinking the same thing. His penis pushes her skirt up and you slide yourself on him so that Keira sits between you on your lovers huge cock. He doesn't penetrate as much as you would like, but you are sure it will be enough. You laugh as you rip her sweater and shirt, revealing her flat chest. You lick at her nipples, while Linus strokes her neckline with his long tongue. All the while you and Linus gyrate together, Keira bouncing with each thrust. You feel her wetness through her clothes. You look up, eyeing Linus one last time, then bite her neck, while Linus takes the other side. She screams, but quickly subsides. Warm blood trickles down your gullet and you come, hard. You quiver, your arms wrapping Keira's waist, pulling yourself into her as much as possible, devouring her life essence. It is a moment of pure ecstasy and the world seems to fade away entirely as a result. Then you find yourself with Keira in your arms, Linus' hand on your shoulder, watching her transformation. Her breasts expand as her figure goes from straight up and down to a shapely, subtle curve. Her skin turns pale and talons grow on her fingers. She opens her pale blue eyes and smiles a fanged smile. Together you make your way back to the office.