Yaoiiiiiiii

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

The firs couple http://www.mangago.me/read-manga/yandere_hitotsu_yane_no_shita/

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

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

TOO WORRIED/POSSESSIVE BORDERLINE YANDERE

- http://www.mangago.me/read-manga/hikizuru_oto/
- http://www.mangago.me/read-manga/imitation_mate/
- http://www.mangago.me/read-manga/mujintou_ni_motte_iku_nara/
- http://www.mangago.me/read-manga/stalker_s_game/
- http://www.mangago.me/read-manga/deichuu_no_hasu/
- http://www.mangago.me/read-manga/obey_me/
- http://www.mangago.me/read-manga/ibitsu_no_kakera/
- http://www.mangago.me/read-manga/yami_bl/
- Ch5: http://www.mangago.me/read-manga/kanchigai_lokidoki_koi/
- http://www.mangago.me/read-manga/individual_diet_preference/
- http://www.mangago.me/read-manga/poison_and_sex/

i tagged these mangas as 'psychological' and 'twisted' which may or may not have a yandere character, but the overall theme and ambiance are similar

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

http://www.mangago.me/read-manga/kimi_ga_koi_ni_oboreru/
http://www.mangago.me/read-manga/hogu_hagyeongsu/?av=2
http://www.mangago.me/read-manga/last_seven_days/
http://www.mangago.me/read-manga/may_belongs_to_me/
http://www.mangago.me/read-manga/ii_mon_waru_mon/
http://www.mangago.me/read-manga/yandere_hitotsu_yane_no_shita/
http://www.mangago.me/read-manga/kawaii_senpai_no_kaigoroshikata/