http://www.mangago.zone/read-manga/bokura_ga_koi_wo_ushinau_riyuu/
http://www.mangago.zone/read-manga/smells_like_green_spirit/
(maybe this one too. i guess it depends of point of view xD)
Tbh Smells like Green spirit was so unique to me it's very hard something else to have even a close vibe to it ;~;
But maybe (??????????)
http://www.mangago.zone/read-manga/blue_lust/
http://www.mangago.zone/read-manga/cut/
http://www.mangago.zone/read-manga/hishakaishindo/
http://www.mangago.zone/read-manga/running_on_empty/
http://www.mangago.zone/read-manga/hanazono_no_kioku/
http://www.mangago.zone/read-manga/goodbye_lilac/
http://www.mangago.zone/read-manga/mou_ichido_nando_demo/
(some of them give me very weird mood just like Smells like Green)
i'm sorry i'm very bad at this (i hope you like at least one of these)
Any yaoi where the seme/uke ends up with the 2nd guy instead of the obvious choice?