I live in flip flops nine months a year and crocs the rest
My heels crack mercilessly
About one a year I get my heels grinded down by an old kimchee breath woman
Not much erotic about it sadly
One thing to try is Salicylic Acid that can be found in acne treatments like Stridex pads. You can make your own pads or even just buy a bottle and add a little to a dish pan tub that is big enough to put your feet in. Wipe your feet with the pads or soak for a few minutes, pat dry or let air dry and then apply a good lotion.
I have done this when my feet are cracked and it really works and it did not sting or burn like some other things I tried.
https://www.livingonadime.com/healing-dry-feet-cracked-heels/
Not where I first found the tip but I trust the site.