Aishite Kureru Hito ga, Ousama

Ever since being cast aside by his ex-lover, Sei Hikawa became a feckless man. He let his hair grow unkempt, without care for his appearance. This aimless way of his is changed by the appearance of a certain man. Wearing a suit and an expensive watch, Kengo Haruki directs Sei and helps him polish both his physical appearance and build his character. But what Kengo wants as compensation is Sei's body...

(Source: Taiyo Tosho, translated)