Dear God, I would kill to hear Koro's internal monologues.
Akihiko: Koro-chan, looks like you gotten bigger. It's good to see you are healthy and well-kept, but you need more protein. I'll make sure to put some in your bowl tonight.
Koro(Monologue): And with that passing remark, the silver-haired savage put his dirty, foul-smelling hand on my head, and matted my meticulously groomed fur. I had to hold back my inner urges to bite the hand that feeds me, but I knew this was not the path a dog followed if he wanted a treat later. Alas, I resisted, but I knew in due time the savage would get his, and I would be there to bask in it all.
p.s. I am awfully sorry for the horrible fan-fic I just wrote.
On the one hand, you'd think Koro would love Akihiko due to their shared love of protein. On the other hand, as a direct competitor for protein within the pack, as well as for the role of alpha and attention from FeMC, Koro may well have been planning on ripping out Akihiko's throat this whole time. Think about it:
Shinji
Ikutsuki
Makoto
Koro will reward Junpei as his Beta in the pack.