Hanamachi Monogatari - Hatsuzakura Mau, Yoru no Shitone

Shuri is bought by Toujou Tatsumi, owner of the brothel "Hanabishi". Thinking he's saved from the mistreatment at his previous workplace, Shuri gladly follows Toujou only to find out that he might have fallen into the clutches of an even worse employer. Based on the same-titled BL game.