just gonna camp here if you dont mind ヾ(☆▽☆)
(2) (=・ω・=)
(3)
Following!
Tsundere tag-
https://www.mangago.zone/tag/Tsundere/
Yandere tag-
https://www.mangago.zone/tag/Yandere/
I would say this one might fit your description
https://www.mangago.zone/read-manga/a_proxy_painter/
Someone asked awhile back but didnt get a response. So any BLs where one of the partners is a tsundere at first then becomes a yandere or possessive? I'm desperate