Saiindoku: Sister to Vampire

One night, while Sister Alicia is looking after the church alone, she is attacked by a beautiful vampire named Albert. Since then, night after night, he sticks his fangs in her skin and she finds herself doing indecent things with him, right in front of God.

(Source: MU)

Included one-shots:
Volume 1: Sakurayoimachi, Yahanmae
Volume 2: Noraneko/Nocturne