A beast x human yaoi manga where they have sex while the other one is in his beast/animal form
(for research purpose)
https://www.mangago.me/read-manga/musebenake_junjou/
https://www.mangago.me/read-manga/shishi_no_odoriko/ (this surprised me alot )
https://www.mangago.me/read-manga/aimai_na_wolf/
https://www.mangago.me/read-manga/yakimochi_wa_kitsuneiro/
https://www.mangago.me/read-manga/kamikudaite_aio_oshiete/
https://www.mangago.me/read-manga/oyasumi_itoshiki_kotori_sama/
https://www.mangago.me/read-manga/tsuki_wa_michikake_kemono_no_koi/
https://www.mangago.me/read-manga/neko_to_mahou_wa_kiss_de_hodokeru/
you can find more if you search "animal characteristics" on the tags search
https://www.mangago.me/read-manga/ookami_sama_no_ichizu_na_bouai/
https://www.mangago.me/read-manga/otoshi_ai/
Hope this helps with your research(● ̄(エ) ̄●)
TJ is a whole on red flag but I can't help but ship this two, I know tj is very toxic but Ian and tj chemistry is wayyyy too good but anyways my Ian need to be with his Jo
Ur the only ian and tj shipper i respect- (づ ̄ ³ ̄)づ