Emanresuym's manga / #Sadist(2)

Ch5.2. Uke is a bandit leader, his subjects kidnap women to try and find him a wife (and they 'share' any failed matches). Seme ruler punishing bandit, pretends to be woman and marries, then reveals he is a man and brutally rapes uke. Uses a drug to make him need semes antidote monthly. Seme ties uke to him more and more, uke gets a chance for freedom if he ranks top 100 in upcoming competition. Unfinished since 2015 tho, thus marking complete.