I don't really understand what yandere means (I do know a literal meaning, just don't know how it works exactly), so I may not be the best person to recommend anything...
http://www.mangago.me/read-manga/kawaii_akuma/
http://www.mangago.me/read-manga/scarlet/
http://www.mangago.me/read-manga/akanai_tobira/ ch.3-4
http://www.mangago.me/read-manga/nise_x_koi_boyfriend/ ch.5
http://www.mangago.me/read-manga/sasayaku_no_wa_sono_yubi/ (I think he's just a psycho though)
http://www.mangago.me/read-manga/kimi_wa_amai_amai/ (I haven't read that one yet)
http://www.mangago.me/read-manga/yume_no_you_na_hanashi/
You can check out the baka-updates tag for yandere here: https://www.mangaupdates.com/series.html?perpage=50&category=Yandere&genre=Yaoi&orderby=title
yandere is basically crazy love. someone who is yandere tends to be obsessed with the main character. they exhibit stalkerish tendencies. think mirai nikki or anything by harada sensei
thanks anyways! ٩(๑❛ᴗ❛๑)۶
well a yandere is someone who's basically a psycho because they're in love :D for example, if someone touches their lover they go crazy and (most of the time) kill that person. (they want them only for themself's)
so they act all cute and nice in front of everyone but when they're alone they get really psycho..sorry my english is so bad omg.. D/: still hope u somehow understood ⁄(⁄ ⁄·⁄ω⁄·⁄ ⁄)⁄

can be the uke or seme idc (づ ̄ ³ ̄)づ