YANDERE (n): an individual who is obsessively devoted to their love interest, to the point of potentially dangerous or even violent behavior.
DISCLAIMER: Some of these books aren't necessarily yandere, they just have possessive and/or obsessive themes.
BxB LIST LINK:
https://www.mangago.me/home/mangalist/2557102/GxG LIST LINK:
https://www.mangago.me/home/mangalist/2557095/