Read it here:
https://archiveofourown.org/works/54301843/chapters/137526925?view_adult=true
And IT IS really good.
He also gets jealous of Leewon's father, asking him if he slept with him, cut his own throat, shot Leewon, etc. I'm not saying that Zhenya is an angel. :D But we're not even halfway to the story. Zhenya will be taking care of Taekjoo's mom more than Taekjoo himself...
You are right when you say Caesar is expressing his love more. Zhenya doesn't even understand why he's so attracted to Taekjoo, so yes, emotionally Caesar is more mature (???), but they also have at least 10 years between them.
Zhenya is a young Caesar. ╮( ̄▽ ̄)╭ Caesar gets obsessed/falls in love really fast. For Zhenya and Taekjoo, their love will develop later.
OOOHHHHH wowie zhenya taking care of other people
and the thing about zhenya and taekjoo's relationship developing later, I thought it might be that zhenya appears worse and redder coz usually when first sexual contact happens in this stories you could already see that the seme usually already have a little bit of affection. But in zhenya's case, dude is just a psycho haha
I got baited again by fans on socmed to read the novel this time ╥﹏╥, so where can you read it?
( ̄∇ ̄") I found a translated one at AO3 but adunno if its the official or fanfic