Can someone please recommend me a yaoi manga where the seme/uke or both r so obsessed with...

Kimi wa amai amai ( tranquilizer chapter ) and the others are worth reading too.
Oh and if you want the creepy stuff try Ogawa chise sensei's woks :)

http://www.mangago.me/read-manga/hitomi_no_honne/
http://www.mangago.me/read-manga/hitomi_no_giwaku/
http://www.mangago.me/read-manga/koi_shika_dekinai_yo/

http://www.mangago.me/home/mangalist/7543/
pairing Kaoru/ Daigo
pairing Chiharu/ Kazuki
Kaoru and Chiharu are cousins and they are kinda crazy-obsessed once they fall in love, the more the story gooes on

Thank u, i'll be sure to read them. :)