http://www.mangago.zone/read-manga/im_the_main_character_of_a_harem_manga_but_im_gay_so_every_day_is_hell_for_me/
^One shot
http://www.mangago.zone/read-manga/zettai_bl_ni_naru_sekai_vs_zettai_bl_ni_naritakunai_otoko/
http://www.mangago.zone/read-manga/i_took_a_trip_to_an_otome_game/
http://www.mangago.zone/read-manga/isekai_tensei_ore_ga_otome_ge_de_kyuuseishu/
This one, I guess:
http://www.mangago.zone/read-manga/zettai_bl_ni_naru_sekai_vs_zettai_bl_ni_naritakunai_otoko/
Not a Shounen Ai:
http://www.mangago.zone/read-manga/mobyama_aji_to_mobtani_crou_no_kareinaru_nichijou_e_no_chousen/
Those are all I know ╮(￣▽￣)╭
shounen-ai that breaks the 4th wall