Kiss no Jikan desu, Goshujin-sama

Io starts working as a lord's valet in the guise of his older twin brother Ces. Lord Kazar has closed off his heart completely in the wake of his friend's betrayal. Undeterred by Kazar's cold demeanor, Io works hard to serve his master, who gradually begins to crack smiles. However, as he and Kazar grow closer, Io starts having misgivings about deceiving his master about his identity...

(Source: Renta!)

Included one-shots: Renai Soudan (Love Talk), Stay by My Side