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You bite hard on your cheek making the blood spill in your mouth and force open Lidya's lips with your tongue. At first she resists but the intoxicating effect of your blood overpowers her strong will. 

Soon she starts to kiss you back trying to get as much blood to pour down her throat. Lidya skin starts to grow paler as she faints away. You know it won’t be long before she wakes up as your new companion. 

Sarah in the meantime, while playing with your wet tight and cold pussy, hasn't realized what is happening to her sister. As you turn to her, she withdraws her hand from you and licks her fingers. 

You kneel in front of her and you spread her legs revealing her soaked “hello kitty” panties. Taking them off she looks at you with a look charged with lust. With your fangs, now fully grown you start playing with her clit.

Lidya, a beautiful child of the night now, has silently moved to occupy the seat next to her sister.