any yandere? gl, straight, bl is fine

I don't know if you count this as yandere, but 'Psycho' might fall into that category. (It's BL)

Link: http://www.mangago.me/read-manga/psycho_young_dream/

Here you go,

http://www.mangago.me/read-manga/you_are_still_in_a_bird_cage/

http://www.mangago.me/read-manga/hachigatsu_kokonoka_boku_wa_kimi_ni_kuwareru/

http://www.mangago.me/read-manga/i_was_wrong/

http://www.mangago.me/read-manga/uruwashiki_shuen/