Odoru Ahou to Kusare Gedou

Itsuki is known as the adopted son of the Chiyomori family. Behind closed doors, however, he's actually employed as the Master's paramour, and indulges in lewd acts with him every night. Along with his devoted attendant, Yoshino, Itsuki endeavours to take over the Chiyomori estate with his intellect alone—even if that means forsaking his body...

(Source: Takeshobo, translated)