I collected the special green slime girl in dorgnia sorry I cant fully remember where in that country or how to spell it's name but I managed to get her affection to 500 and still seem to be able to raise it further it is something I wanted to point out if it is intentional or not I am not 100% sure but here is a screen cap of it
sorry didnt realize I had forgot to add the part showing that I can still improve her relationship