http://www.mangago.zone/read-manga/life_senjou_no_bokura/ not sure abt seme getting karma but this bl is sad. There's also Paradies View, Hybrid Child, Tamayura, this one http://www.mangago.zone/read-manga/bokura_wa_nando_mo_koi_o_suru/ and this one http://www.mangago.zone/read-manga/hate_no_kouya_de_vacances_wo/ . These are all tear-jerker, especially the last one
I dunno if I'm just emotional that time but I cried reading this:
http://www.mangago.zone/read-manga/cosmic_boy/?22lJ
Lemme try again. I hope you haven't read them yet
http://www.mangago.zone/read-manga/kimi_ni_ienai_koto_ga_aru/
http://www.mangago.zone/read-manga/sakura_gari/
http://www.mangago.zone/read-manga/sorekara_kimi_wo_kangaeru/
http://www.mangago.zone/read-manga/haikyu_dj_katsura_komachi_wendy/
http://www.mangago.zone/read-manga/my_childhood_friend_was_a_god/
http://www.mangago.zone/read-manga/1866/
yaoi that makes you cry (short pls) like the seme getting karmaa and regret