The main reason Aeroc didnt fell in love at first sight is beacuse their first meeting, which was Aeroc meeting the lost Kloff was replaced by Aeroc meeting Kloff who just jumped at the sight of him and started to manically yell at him to which Aeroc was like: this man is a fucking psychopath, i should stay far away from this madman.
Then Kloff is the psychopatic maniac that he always was but used Raphiel as an excuse as to why hes like that, Raphiel's death didnt change him, just the real Kloff which is a sadistic abuser came out and stayed since he had an excuse to be a living trash, because the Kloff that didnt experience Raphiel's death is also a fucking mental nutjob (my personal opinion). Going back, hes a madman that he is, courting Aeroc for whatever sick reason since he still claims he despises him, Aeroc staying away since the sick freak scares him as hell and getting mad at Kloff for painting the malnourished and abused Aeroc in the crappy shed and giving it to him. Aeorc thought he must really lost it since the person on the painting cant be him and he sees that as an insult. In the end Kloff is like buhu Aeroc had enough of me, doesnt want my gifts or to see me anymore so I will try to kill myself (i think he wanted to shoot himself). Of course the moron is saved and Aeroc is unfortunately willing to treat him as a human and give him a chance to be a decent anim- ekhem, human being. Kloff is sooo nostalgic about Aeorc and being like: I want to be with the previous Aeroc (ew, its enough he got the raw version of you in the end) but since I cant I will sincerely love this Aeroc and hope this love will reach my Aeroc... The raw Kloff is a trash but the previous one is sure a different level of a fucking bleeding red flag.
I am pretty sure it was mentioned that the imprinting is causing him to be mad. Just like how mc became an omega as side effect from their first timeline, ML retained being imprinted by the MC. That was why he was going pretty crazy really mad towards the end as well. In timeline 3, ML regress and wasn't near the MC or accepted by the MC that is why his madness was overboard. MC even knows that and was surprised on how he was able to be sane when they first met because that is almost impossible. He saved ML from offing himself(he wants to be with mc from timeline 1) and wants to find the omega who imprinted ML but couldnt because the person ML is describing is him in timeline 1.
In timeline 2, his son and him even talks about how imrpinting isnt romantic and almost like a curse. MC imprinted on him and whenever they are faraway or he gets jealous, he gets crazy so ML thinks he wont live long and tells his son to grow up quickly so he can protect the family when he is not around.
can someone spoil what will happen on the third timeline? not ready for the angst