冷たい男 [Tsumetai Otoko]

氷の女王のように美しく、明晰な頭脳を誇るトップエリート、スティーブ・ノーグ。およそこの世に実現不可能なことのない彼にも、悩みがある。「この身と私の人生は、貴方に捧げます」―幼い頃から影のようにいつもそばにいた、7歳年上の忠実な従者・守殿が誓いを破り、野性的なキスを残して去った時、想像もしなかった守殿への想いに気づいてしまったのだ…!完璧な主従関係→下克上愛!新装版は、ショート書き下ろしつき。

Summary from Mangaupdates :
Like the Snow Queen from the same titled novel, Steve Nohgue is famously known within the elite business world for his looks and shrewd mind. Steve has always been used to having everything he wants, including his assistant, Moridono, who has pledged his loyalty to protect and to serve him. Until one day Moridono announced that he no longer wants to be by his side… Why did Moridono abruptly leave his side? Will Steve ever be successful in love as he is in business?!

Adapted from the popular novel, this book also includes a short story of Sagishima x Hokuto from Dekiru Otoko.