Secret Love at Fukurokudou

En is a medicinal master who runs a Chinese Herbal Medicine shop with his apprentice, Tao. Despite being a well-sought medicine master, En tends to be lascivious and pleasures himself with the company of other men, much to the ire of Tao, who has feelings of attraction for his master and tries his best to hide it. Unfortunately for Tao, he isn't exactly subtle, and En knows about his infatuation. En then proceeds to tease his cute apprentice and propose that Tao be his bed partner instead.

(Source: Futekiya)

Note: Chapter 1 was previously released as a one-shot under the title “Kusuri mo Sugireba Koi to Naru (薬も過ぎれば恋となる)” in the Retro BL (レトロBL) anthology, while Chapter 2 was in the Tachi Neko Soudatsu BL (タチネコ争奪BL) anthology.