Hoshi no Yakata centers around the employees of a suburban s/m club. The characters are beautiful, the storylines are angsty, and the artwork is horribly explict. What more could you ask for?
Most of the story takes place inside or on the grounds of Hoshi no Yakata, a humongous European-style mansion.
The story's other locale is Airenrou, another club located a few hours' drive from Hoshi no Yakata.
Name of the 5 volumes :
1) Kneel Down and Kiss my Boots (Hizamazuite Kutsu ni Kiss wo)
2) A Beast in the Cage (Kedamono wa Ori no Naka)
3) The Poacher of Desire (Yokubou no Mitsuryousha)
4) The Prisoner's Destination (Torawarebito no Ikisaki)
5) A Slave's Condition (Dorei tachi no Jouken)

Story about Sarasa who is in conflicts with his very sadistic nature and his relationship with Kazunari.
Vol. #1 Kyouhansha ni Kuchizuke wo
Vol. #2 Yoru wo Hashiru Emono
Vol. #3 Mezametara Soba ni Ite
Sarasa is the head of the student council and the step-son of the principal. He is targeted for sadistic sex-play by one of his classmates. Kazunari, the vice-president of the student council, tries to protect Sarasa, but Sarasa tells him not to get involved. Kazunari doesn't listen, but the more he gets involved, the less he is certain - who is really the sadist, and who is the victim? Will Kazunari's love for Sarasa survive? Will Kazunari survive Sarasa's "love"?
(Source: Evil Empire)