
If another ring is given to him, shouldn't u kill the guy that have it to him.
Like bruh
I love u, but if another man marks you forcefully or without consent, I'm gonna kill U not the guy that did it ┗( T﹏T )┛

Kazuto is assuming that Shinzo would be willingly accepting the ring of that other guy. I.e. if you cheat, I’ll kill you. Never mind that Shinzo hasn’t actually stated he loves Kazuto yet. I say yet, because, let’s be serious here, we all know they’ll end up together. Hopefully it will at least be an interesting ride.
I knew the art looked familiar