Shounen ai

http://www.mangago.zone/read-manga/aitsu_no_daihonmei/
http://www.mangago.zone/read-manga/haikei_niisan_sama/

http://www.mangago.zone/read-manga/number_call/
http://www.mangago.zone/read-manga/seven_days/
http://www.mangago.zone/read-manga/uragiri_wa_boku_no_namae_wo_shitteiru/
http://www.mangago.zone/read-manga/silver_diamond/

http://www.mangago.zone/home/mangalist/200/
http://www.mangago.zone/home/mangalist/10654/

Most Shounen-ai are also in fantasy theme but this list I didn't categorize SA out.
http://www.mangago.zone/home/mangalist/196/

http://www.mangago.zone/read-manga/slow_starter_ichikawa_kei/
http://www.mangago.zone/read-manga/yamete_kudasai_mabushii_desu/
http://www.mangago.zone/read-manga/sonna_me_de_mite_kure/
http://www.mangago.zone/read-manga/500_nen_no_itonami/
http://www.mangago.zone/read-manga/kabe_no_naka_no_tenshi/
http://www.mangago.zone/read-manga/nanadome_no_gomenne/
http://www.mangago.zone/read-manga/koori_no_mamono_no_monogatari/
http://www.mangago.zone/read-manga/toritome_no_nai_koi_no_shi/
http://www.mangago.zone/read-manga/endou_kun_no_kansetsu_nikki/
http://www.mangago.zone/read-manga/yozora_no_sumikko_de/
http://www.mangago.zone/read-manga/yamada_to_shounen/
http://www.mangago.zone/read-manga/tears_of_a_devil/

http://www.mangago.zone/read-manga/canis/

http://www.mangago.zone/read-manga/itsuka_tomodachi_ja_nakunaru_to_shite_mo/
http://www.mangago.zone/read-manga/doukyuusei_nakamura_asumiko/ and the sequel is "Sotsugyousei".
http://www.mangago.zone/read-manga/ani_no_hanashi/
http://www.mangago.zone/read-manga/tokaido_hisame/
http://www.mangago.zone/read-manga/kanjou_spectrum_yoneda_kou/
http://www.mangago.zone/read-manga/natsu_no_omoide_haji/
http://www.mangago.zone/read-manga/vassalord/
http://www.mangago.zone/read-manga/kigurumi_planet/
http://www.mangago.zone/read-manga/unexpected_love/

Are manhwas ok too? I really liked those:
http://www.mangago.zone/read-manga/roureville/
http://www.mangago.zone/read-manga/1001_nights/ (says tragedy, but it has a happy ending)
http://www.mangago.zone/read-manga/the_specific_heat_capacity_of_love/
http://www.mangago.zone/read-manga/vampire_library/
http://www.mangago.zone/read-manga/running_on_empty/