Seme/uke with long hair? And not the popular one like Koisuru boukun, crimson spell etc. :...

my own long hair tag's. maybe you could find something you like
http://www.mangago.zone/people/tag/83677/long+hair+seme/
http://www.mangago.zone/people/tag/83677/long+hair+uke/

http://www.mangago.zone/read-manga/canis/
http://www.mangago.zone/read-manga/brother_auto_spot/
http://www.mangago.zone/read-manga/mede_shireru_yoru_no_junjou/
http://www.mangago.zone/read-manga/akuma_wa_hohoemu/
http://www.mangago.zone/read-manga/karamete_de_kudoite/
http://www.mangago.zone/read-manga/heart_strings/
http://www.mangago.zone/read-manga/akuma_to_issho/
http://www.mangago.zone/read-manga/yami_ni_tooboe_mune_ni_toge/
http://www.mangago.zone/read-manga/corsair/
http://www.mangago.zone/read-manga/hyakunen_kesshou_mokuroku/
http://www.mangago.zone/read-manga/takaramono_wa_hako_no_naka/
http://www.mangago.zone/read-manga/kanga_na_spoon/
http://www.mangago.zone/read-manga/la_satanica/
http://www.mangago.zone/read-manga/kouun_no_rihatsushi/
http://www.mangago.zone/read-manga/doukyuusei_nakamura_asumiko/

Thanks! :D

Wow so many, thanks xD

you're welcome hope you find some you like.