Yamikin Shinshi no Kiken na Akuheki
闇金紳士のキケンな悪癖 · やみきん しんし の きけん な あくへき
est. Rough estimate based on volume count, reprints and magazine — not an official figure
Overview
"Damn, you're a whiny pup, aren't you...? I haven't cum yet." June, the number one rentboy at his brothel, is requested by a client and goes to the hotel as usual. There, he meets a sexy yet suspicious man named Onda. Onda introduces himself as a "money lender"-- a loan shark ? And suddenly he pressures June to repay the debt his ex-boyfriend left behind!? And after all that, he asks June, "Now, then... Why don't you comfort me for a little bit?" June is made to suck his hot, erect cock, and then he's fucked hard and deep...!! (Source: Mobile Media Research)
Source: AniList
External databases: AniList
How to compare editions, collected volumes and ISBNs / Sources, updates and corrections