Check out this list by Anonymous (BL) http://www.mangago.me/home/mangalist/29740/
My own recs would be (more for an interesting story than a huge plot twist)
http://www.mangago.me/read-manga/dog_style/ as I love this story
http://www.mangago.me/read-manga/koujitsuei_no_tobira/
http://www.mangago.me/read-manga/endless_world/
http://www.mangago.me/read-manga/my_god/
http://www.mangago.me/read-manga/smells_like_green_spirit/
http://www.mangago.me/read-manga/itou_san_kuraka_sui/
http://www.mangago.me/read-manga/castle_mango/
http://www.mangago.me/read-manga/akudama/
http://www.mangago.me/read-manga/cut/ maybe it's cliche, but I liked it
Aww (=・ω・=) Thank you so much, you two (╥_╥)
http://www.mangago.me/read-manga/charming_junkie/
http://www.mangago.me/read-manga/tonari_no_kaibutsu_kun/
http://www.mangago.me/read-manga/shinkai_no_venus/
http://www.mangago.me/read-manga/koori_no_mamono_no_monogatari/
http://www.mangago.me/read-manga/silver_diamond/
http://www.mangago.me/read-manga/beast_master/
http://www.mangago.me/read-manga/crimson_spell/
http://www.mangago.me/read-manga/mazu_wa_ubaiai/
http://www.mangago.me/read-manga/hana_no_kishi/
http://www.mangago.me/read-manga/the_inheritance_of_aroma/
http://www.mangago.me/read-manga/ikenai_otoko/
http://www.mangago.me/read-manga/boku_wa_ookami/
http://www.mangago.me/read-manga/honey_x_honey_drops/
http://www.mangago.me/read-manga/oshioki_gakuen/
http://www.mangago.me/read-manga/kiken_na_otonarisan/
http://www.mangago.me/read-manga/neji_no_kaiten/
http://www.mangago.me/read-manga/otona_keikenchi/
http://www.mangago.me/read-manga/under_grand_hotel/
http://www.mangago.me/read-manga/totally_captivated/
http://www.mangago.me/read-manga/sono_koi_ni_wa_wake_ga_aru/
http://www.mangago.me/read-manga/innocent_maze/
http://www.mangago.me/read-manga/ai_no_dna/
http://www.mangago.me/read-manga/love_neko/
http://www.mangago.me/read-manga/seven_days/
http://www.mangago.me/read-manga/puchi_puri/
http://www.mangago.me/read-manga/venus_ni_seppun/
http://www.mangago.me/read-manga/komatta_toki_ni_wa_hoshi_ni_kike/
http://www.mangago.me/read-manga/dear_myself/
http://www.mangago.me/read-manga/kuroneko_kareshi_no_asobikata/
Hmm... Could anyone suggest me some yaoi or shoujo with interesting story concept? Maybe with a huge plot twist?(๑•ㅂ•)و✧