My child... the answer is HARADA
I've read all of Harada's works!
http://www.mangago.me/read-manga/crazy_love/
http://www.mangago.me/read-manga/hanazono_no_kioku/
http://www.mangago.me/read-manga/nise_x_koi_boyfriend/
http://www.mangago.me/read-manga/kami_kon_ni_ai/
http://www.mangago.me/read-manga/sura_s_lover/
http://www.mangago.me/read-manga/hogu_hagyeongsu/?vH2p
http://www.mangago.me/read-manga/you_re_my_favorite_toy/
Tysm!
Happy reading (๑•ㅂ•)و✧
Yandere, possessive semes? Preferably completed.