Brother by Ougi Yuzuha is one of my faves.
blood-related
http://www.mangago.zone/read-manga/suutsu_wo_kita_akuma/ (part 1 = chapter 5)
http://www.mangago.zone/read-manga/ouji_to_joujin/ (part 2)
http://www.mangago.zone/read-manga/himegoto_wa_ouji_no_tashinami/ (part 3)
http://www.mangago.zone/read-manga/doko_ga_ikenai/
http://www.mangago.zone/read-manga/juukei_hanazono/tr/119139/page/88/
http://www.mangago.zone/read-manga/sawatte_tokashite/an/sawatte-tokashite-chapter-8.html/2/
http://www.mangago.zone/read-manga/ibitsu_no_kakera/ (pretty messed up)
without blood relations:
http://www.mangago.zone/read-manga/bomb_heaven/
http://www.mangago.zone/read-manga/familiar/
http://www.mangago.zone/read-manga/abarenbou_kareshi/an/abarenbou-kareshi-chapter-3.html/3/
http://www.mangago.zone/read-manga/zankokuna_kimi_to_tomoni/
http://www.mangago.zone/read-manga/melancholic_trickster/
http://www.mangago.zone/read-manga/otouto_ja_irarenai/ ongoing
you can also check out my incest list
http://www.mangago.zone/home/mangalist/11763/
their relation and if they are blood-related or not is noted down in the review
Can anyone suggest a little brother(seme) x older brother(uke) story? I'm in the mood for both yoai and shounen-ai ლ(´ڡ`ლ)