Zettai Aragaenai Amai Meirei [Dom/Sub Universe]

In addition to male and female, there are two secondary genders: doms, who want to dominate others, and subs, who want to be dominated. Hoshino Nanakura, a nurse working at a small clinic, thinks she is neither... until she encounters Yodaka, an unusually powerful dom who can make anyone obey his commands, awakening Hoshino's inner sub. The head of an influential crime family, Yodaka rescues Hoshino from a tight spot, and places her under his protection. Trapped in the lair of the crime boss, Hoshino gradually succumbs to Yodaka's increasingly bold advances, not sure if what she feels is pleasure, punishment, or both...