Maybe this? They work at the bookstore (⌒▽⌒) http://www.mangago.me/read-manga/fuuzokugurui_desu_ga_toshishita_danshi_ni_kokuraremashita/
I know what manga you are after I just can't remember the name, but it was one of the stories in a manga I read last year. The uke goes to soap land to fool around doing kinky play with the girls there and he gets curious about the seme who confesses to him.
I replied to you before but somehow it didn't appear? Don't know if it's just me or not so I reply again just to be sure http://www.mangago.me/read-manga/fuuzokugurui_desu_ga_toshishita_danshi_ni_kokuraremashita/
Yes this is exactly the one I was talking about! I'm sure Anonymous this is the one too.
Help! Please help find a yaoi manga where the seme and uke work together. The seme is expressionless but is hopelessly in love with the perverted older uke. The uke goes to visit prostitutes often but totally loves doing ecchi with the seme.