There are a lot of practical reasons why Beth can't divorce her wife, which is unfortunate, because she really wants to.
it's not a love match by any means, but she stil expected some measure of fidelity, to preserve her own dignity and respect within the community. That was apparently too much for Kailee, who spent the last two years fucking everything over eighteen that moved.
But Beth can't divorce her.
That doesn't mean she has to just lie there and take it.
She starts growing Kailee's tits first. They're well-used, and it takes very little magic to make them grow--a little a day, but it adds up fast. She puts another few cup sizes onto Kailee.
Then she stops and lets Kailee get complacent. Lets her think it's a fluke.
Kailee's walking goes next. It's not that Kailee can't walk, but when she's not actively doing something to benefit Beth she just finds it...easier to crawl.
Kailee's hands Beth makes clumsy, taking away dexterity until she needs help with even simple things like doing her makeup or writing.
Kailee's hardly leaving the house at this point, and some part of her must know what's going on, but Beth feigns at sympathy, helps her with just a little strategic condescension, and Kailee seems to buy her ignorance.
Beth starts Kailee's lactation just before leaving the house, so she can come back to Kailee as a sticky aching mess, too clumsy to change her clothes or even get all the milk out easily. Beth suggests a milking schedule and then has the milking make Kailee unbearably horny, but at this point her hands are too clumsy to rub herself to an orgasm.
Beth lets her hump a pillow sometimes, as a reward for good behavior.
She considers bringing in some of Kailee's favorite paramours to offer them a chance to fuck her like this, useless and horny and messy. Maybe that will be Kailee's final punishment, taking away that last measure of dignity the way Kailee took away Beth's.