Responses
I was Told to Relinquish My Fiance to My Little Sister, and the Greatest Dragon Took a Liking to Me and Unbelievably Took Over the Kingdom
https://www.mangago.zone/read-manga/i_was_told_to_relinquish_my_fiance_to_my_little_sister_and_the_greatest_dragon_took_a_liking_to_me_and_unbelievably_took_over_the_kingdom/
https://www.animenewsnetwork.com/encyclopedia/manga.php?id=30159
This is the link to what im looking for, so this isnt it but thank you
Imōto ni Konyakusha o Toraretara, Kemono na Ōji ni Kyūkon Saremashita / My sister took away my fiance and now I'm being courted by a beastly prince