There are two essential truths to learn about Cait:
1) She is, as Atugia wonderfully puts it, friend shaped.
2) She is a gorgeous (cat) girl genius whose good looks and golden brain will go down in history.
Her curiousity and raw talent towards magic don't currently get anywhere near enough time in the spotlightб, IMO. If she ever finds a way to study and/or power up magic through fucking, she will get so OP that SHE will be the one soloing Kas with the Champ there just for moral support.
I did think it wrong that she would spread her legs for anyone because of some dude she worshipped
She spreads her legs and love so freely because she was raised with an expressed purpose of doing so - and more importantly, because she never took any issue with that particular aspect of Malachite creed. Were she raised in a more chaste environment, she likely would have still had the same slooty heart. So she would have still melted in face of any physical expressions of genuine affection and had trouble with the concept of romantic exclusivity. You know, like a cat.
Speaking of cats, I'd love if there eventually was an option to properly send off the cat harem girls with enough money and provisions after you initially choose to have them stay. Because half the time I pick that option only as a result of being broke at the time of making the decision.