Responses
http://www.mangago.me/read-manga/color_recipe/
http://www.mangago.me/read-manga/yandere_hitotsu_yane_no_shita/
http://www.mangago.me/read-manga/hoshoku_sha_kisumi_kun/
http://www.mangago.me/read-manga/you_re_my_favorite_toy/
you can also look under the tag!
http://www.mangago.me/tag/yandere/
http://www.mangago.me/tag/stalker/
Where the Wind Stays (There's sites other than this one that have the Mature content version)
pleaseeee, even better if they have sexual scenes