Protective: http://www.mangago.me/read-manga/sick/
http://www.mangago.me/read-manga/nirameba_koi/
http://www.mangago.me/read-manga/i_want_to_be_naughty/ (This series.)
Incest: http://www.mangago.me/read-manga/nekoka_danshi_no_shitsukekata/ (Shounen-ai)
http://www.mangago.me/read-manga/virgin_star/
http://www.mangago.me/read-manga/shitteru_yo/ (Ongoing)
lol oops.. virgin star and shitteru yo should be both in the protective category! XD NO INCEST
Love Stage (older brother has complex) Genwaku no Kodou (younger brother has the complex)
http://www.mangago.me/read-manga/mamotte_agemasu_yamato_nase/
http://www.mangago.me/read-manga/kitto_kiss_o_suru_toki/
http://www.mangago.me/read-manga/wagamama_dakedo_itoshikute/
http://www.mangago.me/read-manga/heaven_s_love/
http://www.mangago.me/read-manga/his_arrogance/ mc and his brother have a brother complex about each other
http://www.mangago.me/read-manga/empty_heart/
http://www.mangago.me/read-manga/paradise_heaven/
http://www.mangago.me/read-manga/m_nano_baka_nano_hentai_nano/
Any yaoi with brother complexes? They don't have to get together in the end...or something like protectiveness over older/ younger brother. i dunno... thanks!(づ￣ ³￣)づ