"Such magic is also useful for breeding cats!"
Suddenly, Princess feels her belly begin to swell, expanding unnaturally large as a the previously fertilized eggs within her body rapidly grow and develop into unborn fetuses within her womb.
Instinct tells her that she is on the verge of giving birth. Her mind doesn't want to accept this truth, but her body is already pushing, trying to eject her offspring from her body.
MEOWWWWWW!! She howls in pain.
Princess falls down to her side, and looks down at her belly. Oh God! Not only was she carrying kittens, but her teats were bloated, so much so that they ached. Teats? She didn't realize til now that cats had so many.
And not only was she about to give birth, but she was going to be forced to nurse them!
The super-pregnant kitty then looks over at the mink, obviously striken with the same problems: huge belly, swollen teats. Soon they would both be mothers!
Queen Belle watched tearfully in silence as the kitty and mink, formerly her husband and daughter, hisssed and groaned in incredible pain as their vaginal lips stretched open, simultaneously exposing the heads of the first of their many offspring.