Call of the Night, Vol. 13 By Kotoyama (Awaiting a re-print)

Antisocial, dorky boy seeks fun-loving, sexy vampire for blood-sucking and transforming into her minion

Ko’s powers increase formidably and dangerously. Nazuna learns a new vampire rule about love that could be her undoing. To make matters worse, an enemy discovers the object capable of destroying her! Meanwhile, while Azami and Susuki continue to pursue heartless vampire Kiku, Kiku meets…Mahiru’s mom?