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Abyss internally thanked the heavens that Chaos was so oblivious like this sometimes, although well, she thought he was oblivious but through a personal standpoint Chaos had a lot of common sense within certain things, and he was not oblivious about other men finding breasts attractive for some strange reason. Although sadly, he couldn't agree with them.
He found the breasts of Abyss attractive though, mostly because it was Abyss, anything on her was cute and attractive to him, even her big and slimy tentacles leaking oily black goo.
Chaos looked one last time at Abyss curiously and then he petted her again, after that, he looked back to Cthully and inspected her Status, finding out that she had gained a nice assortment of Skills and Abilities, alongside an increase in all her Stats, her Mana was around two hundred million now, which was impressive for a Summon.
Check "The Protagnist's Sister Is Actually the Strongest"!