Honestly it would be more uncomfortable if the real big Abel before reincarnation has any romantic feelings to Karas. I mean he is like his nanny and to fall in love to the kid you nurture is just beyond moral. That's why I get it why the author killed the big Abel and make him meets Karas in a different situation, making them falling in love under different circumstances. That's more comfortable to read.
P.S : Well, the author should've drawn a man like Clara instead of a twink as the reincarnated Abel tho
Wait a bit more and you'll see them getting their just deserts. And our couple will get got and heavy eventually,.if the manhwa won't get censored.
Also, you'll see the big muscly bottom again, though not Abel.
And reincarnating as a Twink was the perfect cover. Anything other might ensue suspicion. But not someone so different.
Also.
Spoiler.
Karas doesn't care for appearances. At some point he laments Abels isn't big and sturdy like before. Now Karas has to be considerate of Abel and not just ram as much as he wants to. :D hope it's a bit of consolation for you.
I loved the story and it's ending, was honestly very surprised how well everything came together and how consistent the characters were. Kara's will be Karas and Abel will be Abel till the end with all it's good, bad and gore. It wasn't always pretty, but loved how consistent it was.
And no empty words or coincidences. A gazillion tchechovs rifles on the walls, that eventually shoot.

I love how heartbreaking this is at the beginning, seriously gave me tears in my eyes. But! When he reincarnates into a little twink, I can't help but be annoyed. Why did the author make a perfectly good muscly bottom as a throwaway?! I accepted this, but the absolute irritation I have at these people!! Karas and Abel, they're both annoyingggg!! It's so well-written and I'm actually invested in the politics, it's so interesting-- but I'm SICK of these asshole tops and twinkerbell bottoms!!! I stay only to see them hopefully fuck, but I doubt we'll see them do anything. Also, I don't see that one bad guy (the blonde obsessed with the Regas) die, I will be pissed. If this story was bad, I would've dropped it after that reincarnation, but I stay reading to see the ending.