Any suggestions part 2

Both seme and uke: http://www.mangago.zone/read-manga/mede_shireru_yoru_no_junjou/
Uke: http://www.mangago.zone/read-manga/ginchou_kidan/
Uke: http://www.mangago.zone/read-manga/roumantei_no_juunin/

modern prostitute, no oneshots but not very long (about 4ch)
http://www.mangago.zone/read-manga/after_morning_love/
http://www.mangago.zone/read-manga/love_home/
http://www.mangago.zone/read-manga/aiso_tsukashi/
http://www.mangago.zone/read-manga/oboreru_hitomi/
http://www.mangago.zone/read-manga/the_end_of_youth_ai_no_uta/

2 of my fav mangas have prostitue uke. But there are not many chapters -
http://www.mangago.zone/read-manga/itou_san_kuraka_sui/
http://www.mangago.zone/read-manga/boys_next_door/
Give them a try if you don't mind short mangas. Both are highly recommended.

http://www.mangago.zone/tag/Prostitute+uke/

Scarecrow's Prostitution/Brothels/Male Oiran
http://www.mangago.zone/home/mangalist/44052/
helix's Host || Male prostitute
http://www.mangago.zone/home/mangalist/59465/

Boy Next Door, by Kaori Yuki... but it's insanely sad.