Wolf Pack
https://www.mangago.zone/read-manga/sangyang_the_wanderer/ They are human at first, but a tattoo started forming on his back and eventually he will turn into a wolf. Overall, the story is really interesting and intriguing. You should definitely give it a shot.
THANK YOU
THANKKSSS
Somehow I have a weird ass sh*t collection of these kinds of genre here are some of them I didn't put the modern ones since you said you wanted historical
This one is not historical but the seme is actually a violin one of my favorites( plus the art style is immaculate)
https://www.mangago.zone/read-manga/goodbye_nameless_violin/
Mostly the historical stuff revolves around deities and stuff and the modern ones are the ones with object and etc.
https://www.mangago.zone/read-manga/aijitsu_to_hanayome/
https://www.mangago.zone/read-manga/rajou_koidzukiyo/
https://www.mangago.zone/read-manga/matsuyoi_no_oni/
https://www.mangago.zone/read-manga/kemono_jingai_bl/
https://www.mangago.zone/read-manga/sura_s_lover/
https://www.mangago.zone/read-manga/koisuru_ryuu_no_shima/
Yall I need like possession historical BL I would prefer if it's at first non human lol makes it more interesting and then they transform into a human body. I've seen like 2 now a doll and a bird pls give me some more