Ok so i have a pretty long suggestion but hear this out...
I feel that the ninja cat is out of place in the game, as it seems he serves no real purpose especially being in the museum. If you move him it would make this more believable. *your choice to move him or not* Move him to the forest or park *trees
*, and this is where he gets useful, If you beat him say 5 times, have a high Dex stat and the Stealth perk/trait you get the option of following him to a ninja clan. When you get there you get ambushed by *idk 3-5* ninja cats, and when you beat them all their Master comes out and acknowledges your talents and ask you for help against the Monkey King and his tyranny
*this makes him useful too*
Before so you must complete a set number ninja Task and quest for the master *requiring different stat checks, monster hunting, deliveries ect, id say like 4 different quest one requiring strength, another perception, a delivery mission, and last a monster hunt or whatever. So you complete these earning the masters' respect, and you and say a squad of cats head out to the museum to fight the monkey king and you fight 3-4 clockwork foxes, 1 ape *like the football gorilla*, and then the monkey king.
when you beat the monkey king you are given 3 options:
1:kill him there so he doesn't return *thus taking him out the game*
2:rape him and let him go *allowing him to still be an outside enemy*
3:bring him back to the master *which leads to this*
If you choose to bring him back to the master, the master will reward you by having various kitty sex with you *the master being the dominant one despite what trait you have* AND allowing you to have sex with the Former monkey king as a much as you want *Sex slave status*
End Story.
Bonus content: Remember the ninja cat you followed to get the this place *Tree village idk what to call the place* Well lets say he was the masters Right hand Cat and you kinda took that spot from him when you beat the monkey king, so he puts all bets on the line in one final fight against you Loser becomes the others sex slut forever *i want to say until the other beats the other but idk how you'd code that.*
If you win,and you have the Dominate, you get to dom the Ninja cat and have a Threesome with the master, with you and the master being the doms on the ninja cat. If you have the submissive trait and win, you dom the Ninja Cat and the master doms you *if you choose the Threesome option* If you lose then vise versa and they have their fun with you despite if Dom or Sub...
Im sorry this is so long but its just something i put alot of thought into, i have other ideas for other creatures to have more of a role, but idk if they are good or not idk second guessing myself. I hope you liked this or give it some thought.
Thank you.