
I feel like this is a joke yaoi cause I can’t yall. How do y’all ship that I-

Well... They arent blood related and its more like family made based. Plus from the looks of it Beasts grow faster than humans and have a greater understanding of their surroundings.
Kouju loves Shizuka because Shi chan found him and took care of him even when his birth family abandoned him. To Kou Shi chan is a constant in his life that he wants to keep and build a actual family not a make shift one.
You are correct that this might be a joke yaoi but it is a reminder that you can find love and embrace others even when you have been hurt or abandoned by those who's duty were to love you no matter what.
But i might be wrong in assuming this is what you were wanting to discuss so please let me know so i can give you a proper reply (=・ω・=)

Ok.... and I am kat. Now on to other matters than this one. The beasts are higher intelligence than normal animals. To reiterate they are not related by blood and have a familial relationship tho one-sided. Kou wants to make them a family for real and not keep their pseudo. He wants Shi-chan to see him as a potential partner and no his "son".
Ah I feel like this one is better then the first one
I felt the opposite. The first one made me smile at the cuteness while this was full of smugness that the uke never quite shook off. Also, there was the old unnecessary attempted rape trope.